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Product Overview:


Below are a list of products that can be purchased for a student, school or a contact.

'Current Year' refers to the Caribou Cup year from 1 July to 30 June.

To make a purchase or generate an invoice click here.

Purchasable For Students

This book introduces the reader to calcrostic puzzles. A useful tool for preparing for calcrostic puzzles on contests, this is also suitable for anyone who enjoys mathematical puzzles like Sudoku, Kakuro, Magic Squares, etc. The book is a pdf file and currently it is only available in English.

Different solving techniques are explained and demonstrated with examples. Apart from logical thinking when creating case distinctions one can use algebra for formulating and solving simple equations, inequalities, the pigeonhole principle, divisibility rules up to more challenging algebra when trying to solve rational calcrostic puzzles. A collection of calcrostics for the different types provides practice material for a wide range of difficulty levels suitable for students from grade 3/4 to 11/12.

To download and print this book, sign in and go to "View Purchases".

Contents:

  • 1. What is a Calcrostic?
  • 1.1. Did you know?
  • 2. How to Solve Calcrostics?
  • 2.1. Clues, clues, clues
  • 2.2. An Example Solution
  • 2.3. More Solutions
  • 2.4. Puzzles involving Rational Numbers
  • 2.4.1. Qualitative Description
  • 2.4.2. Partial Fraction Decomposition of Rational Numbers
  • 2.4.3. Conclusions and Examples
  • 3. Integer 3 × 3 Problems
  • 4. Integer 3 × 3 Problems with Diagonals
  • 5. Rational 3 × 3 Problems
  • 5.1. A 3 × 3 Problem with Solution
  • 5.2. More 3 × 3 Problems
  • 6. Rational 5 × 5 Problems
  • 6.1. A 5 × 5 Problem with Solution
  • 6.2. More 5 × 5 Problems
  • 7. Rational 7 × 7 Problems
  • 7.1. A few 7 × 7 Problems with Solution
  • 7.2. More 7 × 7 Puzzles

This purchase allows an Individual student to participate the Grade 11/12 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 11/12 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase allows an Individual student to participate the Grade 2 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 2 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 2 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase allows an Individual student to participate the Grade 3/4 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 3/4 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase allows an Individual student to participate the Grade 5/6 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 5/6 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 7/8 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase allows an Individual student to participate the Grade 7/8 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase allows an Individual student to participate the Grade 9/10 contests for the current Caribou Cup (1 July - 30 June).

Each student needs a valid access code from the current year to participate. To ensure that the student’s access code has been credited, their Caribou Contact should log in and verify that 'Valid for Entire Year' is checked off for this code in 'Display Access Codes'.

This purchase also includes unlimited access to the Interactive Online Games on the Games page. Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 9/10 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This grants all inclusive access for one grade 11/12 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This grants all inclusive access for one grade 2 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This grants all inclusive access for one grade 3/4 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This grants all inclusive access for one grade 5/6 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This grants all inclusive access for one grade 7/8 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This grants all inclusive access for one grade 9/10 student, for the current school year (July-June). All Inclusive Access Includes:

  • Contest Access
  • Written Solutions Practice Tests for the Current Year and all Grade Levels after each contest
  • Written Solutions Practice Tests for all previous Years back to 2009 and all Grade Levels
  • The Calcrostic Book
  • The Mini-Courses:
    • Chomp iChomp
    • Geometree
    • Proof By Induction
    • Mazes

This purchase gives an Individual all-inclusive access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Current Caribou Cup after each contest
  • Answers and Written Solutions for the contests of all Previous Years and all grade levels back to 2009
  • Interactive Practice for these contests on the page Previous Tests
  • Unlimited access to Interactive Games on the Games page
  • The Calcrostic Puzzle book which can be accessed and printed under "View Purchases"
  • All of our Mini-Courses & Tutorials accessible from the Games page:
    • GeomeTree
    • Chomp+iChomp
    • Proof By Induction
    • Mazes

This purchase does not include contest participation. It is intended for those who are already participating through their school or those who want to practice but do not want to participate in the contests.

This purchase gives an Individual access to the Chomp and iChomp mini-courses for the duration of the current Caribou Cup (1 July - 30 June) :

  • No prerequisites are needed, as everything is derived from first principles
  • Over 60 questions and their answers guide the reader in their study
  • Progressive content suitable for all grade levels :
    • Elementary school : hints for improving playing strength
    • Middle school : introduction of binary numbers and their arithmetic including conversion to decimal numbers and the XOR operator
    • High school : short theorems and their proofs by induction, the Sprague-Grundy Theory applicable not only to Chomp and iChomp but to all impartial combinatorial games
  • Exact algorithms for specific classes of positions
  • A hypothesis about similarities between losing positions in Chomp and primary numbers

Upon purchase, you can access the Chomp and iChomp mini-courses by signing in and choosing Chomp and iChomp in the Games menu. On these pages, the mini-courses are in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to GeomeTree for the duration of the current Caribou Cup (1 July - 30 June) :

  • 56 interactive geometry worksheets grouped into 9 categories
  • Curriculum material, interactive constructions as well as formula discovery and proofs
  • Progressive content suitable for elementary, middle, and high school students
  • Worksheets are organized in a tree of dependencies to guide students through a structured and consistent experience of learning and discovery
  • Each worksheet has an introduction, guided interactive construction, a summary page and a quiz
  • Interested students can tackle challenges beyond the school curriculum including the geometry of playing Billiards, the construction of 72°, 36°, 18°, 9° angles, constructing a pentagon and a 17-gon
  • No prerequisites are required

Upon purchase, you can access GeomeTree by signing in and choosing GeomeTree in the Games menu.

This purchase gives an Individual access to the Mazes tutorial for the duration of the current Caribou Cup (1 July - 30 June) :

  • These are typical mazes fulfilling two simple conditions :
    1. any two points can be linked, and
    2. there is no closed path
    Despite its generality, this class of mazes has remarkable properties.
  • First the tutorial explains useful notations, then the reader is guided in the discovery of the 6 magic points in every maze and using these points to find the solution.
  • 30 progressive questions with illustrated examples that give the reader understanding of the global structures which characterize these mazes.

Upon purchase, you can access the Mazes tutorial by signing in and choosing Mazes in the Games menu. The tutorial is in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French and in Persian.

This purchase gives an Individual access to the Proof by Induction site for the duration of the current Caribou Cup (1 July - 30 June) :

  • Through a simple step-by-step example, the reader learns how to apply the proof by induction technique.
  • Then, the reader can practice applying this technique by performing 46 different proofs by induction for summation rules, product rules, theorems about divisibility and Fibonacci sequences.
  • All proofs can be followed step-by-step in an example mode then performed interactively by the user.
  • This unique learning tool allows the user complete freedom in how they formulate each proof.
  • Each step is checked by an automatic proof verification system.
  • At the end, the user can print a copy of their own proof or have it emailed to them.

Upon purchase, you can access the Proof by Induction site by signing in and choosing Induction in the Games menu.

This product is currently only available in English.

This purchase gives an entire School all-inclusive access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Participation in the Current Caribou Cup Contests for an unlimited number of students
  • Answers and Written Solutions for the Current Caribou Cup after each contest
  • Answers and Written Solutions for the contests of all Previous Years and all grade levels back to 2009
  • Interactive Practice for these contests on the page Previous Tests
  • Unlimited access to Interactive Games on the Games page
  • The Calcrostic Puzzle book which can be accessed and printed under "View Purchases"
  • All of our Mini-Courses & Tutorials accessible from the Games page:
    • GeomeTree
    • Chomp+iChomp
    • Proof By Induction
    • Mazes

Upon purchase of a School Wide Pass, all student access codes already registered under the School’s Contacts’ accounts automatically become 'valid for entire year', as will any new codes generated by these accounts. You should verify this in 'Display Access Codes'.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This book introduces the reader to calcrostic puzzles. A useful tool for preparing for calcrostic puzzles on contests, this is also suitable for anyone who enjoys mathematical puzzles like Sudoku, Kakuro, Magic Squares, etc. The book is a pdf file and currently it is only available in English.

Different solving techniques are explained and demonstrated with examples. Apart from logical thinking when creating case distinctions one can use algebra for formulating and solving simple equations, inequalities, the pigeonhole principle, divisibility rules up to more challenging algebra when trying to solve rational calcrostic puzzles. A collection of calcrostics for the different types provides practice material for a wide range of difficulty levels suitable for students from grade 3/4 to 11/12.

To download and print this book, sign in and go to "View Purchases".

Contents:

  • 1. What is a Calcrostic?
  • 1.1. Did you know?
  • 2. How to Solve Calcrostics?
  • 2.1. Clues, clues, clues
  • 2.2. An Example Solution
  • 2.3. More Solutions
  • 2.4. Puzzles involving Rational Numbers
  • 2.4.1. Qualitative Description
  • 2.4.2. Partial Fraction Decomposition of Rational Numbers
  • 2.4.3. Conclusions and Examples
  • 3. Integer 3 × 3 Problems
  • 4. Integer 3 × 3 Problems with Diagonals
  • 5. Rational 3 × 3 Problems
  • 5.1. A 3 × 3 Problem with Solution
  • 5.2. More 3 × 3 Problems
  • 6. Rational 5 × 5 Problems
  • 6.1. A 5 × 5 Problem with Solution
  • 6.2. More 5 × 5 Problems
  • 7. Rational 7 × 7 Problems
  • 7.1. A few 7 × 7 Problems with Solution
  • 7.2. More 7 × 7 Puzzles

This purchase gives an entire School access to the Chomp and iChomp mini-courses for the duration of the current Caribou Cup (1 July - 30 June) :

  • No prerequisites are needed, as everything is derived from first principles
  • Over 60 questions and their answers guide the reader in their study
  • Progressive content suitable for all grade levels :
    • Elementary school : hints for improving playing strength
    • Middle school : introduction of binary numbers and their arithmetic including conversion to decimal numbers and the XOR operator
    • High school : short theorems and their proofs by induction, the Sprague-Grundy Theory applicable not only to Chomp and iChomp but to all impartial combinatorial games
  • Exact algorithms for specific classes of positions
  • A hypothesis about similarities between losing positions in Chomp and primary numbers

Upon purchase, you can access the Chomp and iChomp mini-courses by signing in and choosing Chomp and iChomp in the Games menu. On these pages, the mini-courses are in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French, Persian, and Mandarin.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Participation in the 6 contests of the Current Caribou Cup for an unlimited number of students
  • Unlimited access to Interactive Games on the Games page

Upon purchase of School Wide Access, all student access codes already registered under the School’s Contacts’ accounts automatically become 'valid for entire year', as will any new codes generated by these accounts. You should verify this in 'Display Access Codes'.

Access to contest answers and solutions for the current year’s and past years’ contests are available for purchase separately, as well as all-inclusive bundles.

This purchase gives an entire School access to GeomeTree for the duration of the current Caribou Cup (1 July - 30 June) :

  • 56 interactive geometry worksheets grouped into 9 categories
  • Curriculum material, interactive constructions as well as formula discovery and proofs
  • Progressive content suitable for elementary, middle, and high school students
  • Worksheets are organized in a tree of dependencies to guide students through a structured and consistent experience of learning and discovery
  • Each worksheet has an introduction, guided interactive construction, a summary page and a quiz
  • Interested students can tackle challenges beyond the school curriculum including the geometry of playing Billiards, the construction of 72°, 36°, 18°, 9° angles, constructing a pentagon and a 17-gon
  • No prerequisites are required

Upon purchase, you can access GeomeTree by signing in and choosing GeomeTree in the Games menu.

This purchase gives an entire School access to the Mazes tutorial for the duration of the current Caribou Cup (1 July - 30 June) :

  • These are typical mazes fulfilling two simple conditions :
    1. any two points can be linked, and
    2. there is no closed path
    Despite its generality, this class of mazes has remarkable properties.
  • First the tutorial explains useful notations, then the reader is guided in the discovery of the 6 magic points in every maze and using these points to find the solution.
  • 30 progressive questions with illustrated examples that give the reader understanding of the global structures which characterize these mazes.

Upon purchase, you can access the Mazes tutorial by signing in and choosing Mazes in the Games menu. The tutorial is in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French and in Persian.

This purchase gives an entire School access to the Proof by Induction site for the duration of the current Caribou Cup (1 July - 30 June) :

  • Through a simple step-by-step example, the reader learns how to apply the proof by induction technique.
  • Then, the reader can practice applying this technique by performing 46 different proofs by induction for summation rules, product rules, theorems about divisibility and Fibonacci sequences.
  • All proofs can be followed step-by-step in an example mode then performed interactively by the user.
  • This unique learning tool allows the user complete freedom in how they formulate each proof.
  • Each step is checked by an automatic proof verification system.
  • At the end, the user can print a copy of their own proof or have it emailed to them.

Upon purchase, you can access the Proof by Induction site by signing in and choosing Induction in the Games menu.

This product is currently only available in English.

This purchase gives an entire School access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the contests of all grade levels of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

All-inclusive bundles can be purchased.This product is also available in French, Persian, and Mandarin.

This book introduces the reader to calcrostic puzzles. A useful tool for preparing for calcrostic puzzles on contests, this is also suitable for anyone who enjoys mathematical puzzles like Sudoku, Kakuro, Magic Squares, etc. The book is a pdf file and currently it is only available in English.

Different solving techniques are explained and demonstrated with examples. Apart from logical thinking when creating case distinctions one can use algebra for formulating and solving simple equations, inequalities, the pigeonhole principle, divisibility rules up to more challenging algebra when trying to solve rational calcrostic puzzles. A collection of calcrostics for the different types provides practice material for a wide range of difficulty levels suitable for students from grade 3/4 to 11/12.

To download and print this book, sign in and go to "View Purchases".

Contents:

  • 1. What is a Calcrostic?
  • 1.1. Did you know?
  • 2. How to Solve Calcrostics?
  • 2.1. Clues, clues, clues
  • 2.2. An Example Solution
  • 2.3. More Solutions
  • 2.4. Puzzles involving Rational Numbers
  • 2.4.1. Qualitative Description
  • 2.4.2. Partial Fraction Decomposition of Rational Numbers
  • 2.4.3. Conclusions and Examples
  • 3. Integer 3 × 3 Problems
  • 4. Integer 3 × 3 Problems with Diagonals
  • 5. Rational 3 × 3 Problems
  • 5.1. A 3 × 3 Problem with Solution
  • 5.2. More 3 × 3 Problems
  • 6. Rational 5 × 5 Problems
  • 6.1. A 5 × 5 Problem with Solution
  • 6.2. More 5 × 5 Problems
  • 7. Rational 7 × 7 Problems
  • 7.1. A few 7 × 7 Problems with Solution
  • 7.2. More 7 × 7 Puzzles

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 11/12 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 11/12 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 2 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 2 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 3/4 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 3/4 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 5/6 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 5/6 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 7/8 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 7/8 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Grade 9/10 contests of the current Caribou Cup after each contest
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

This purchase is ideal for students participating in the current year’s contests who want to check their solutions or those who want to try out the current year’s contests and see the solutions without participating in the contests themselves.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2015/16 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2016/17 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2017/18 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2018/19 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the grade 9/10 contests of the 2019/20 Caribou Cup
  • Interactive Practice for these contests on the page Previous Tests
  • Bonus : Unlimited access to Interactive Games on the Games page

All-inclusive bundles can be purchased. This product is also available in French and Persian.

This purchase gives an Individual all-inclusive access to the following for the duration of the current Caribou Cup (1 July - 30 June) :

  • Answers and Written Solutions for the Current Caribou Cup after each contest
  • Answers and Written Solutions for the contests of all Previous Years and all grade levels back to 2009
  • Interactive Practice for these contests on the page Previous Tests
  • Unlimited access to Interactive Games on the Games page
  • The Calcrostic Puzzle book which can be accessed and printed under "View Purchases"
  • All of our Mini-Courses & Tutorials accessible from the Games page:
    • GeomeTree
    • Chomp+iChomp
    • Proof By Induction
    • Mazes

This purchase does not include contest participation. It is intended for those who are already participating through their school or those who want to practice but do not want to participate in the contests.

This purchase gives an Individual access to the Chomp and iChomp mini-courses for the duration of the current Caribou Cup (1 July - 30 June) :

  • No prerequisites are needed, as everything is derived from first principles
  • Over 60 questions and their answers guide the reader in their study
  • Progressive content suitable for all grade levels :
    • Elementary school : hints for improving playing strength
    • Middle school : introduction of binary numbers and their arithmetic including conversion to decimal numbers and the XOR operator
    • High school : short theorems and their proofs by induction, the Sprague-Grundy Theory applicable not only to Chomp and iChomp but to all impartial combinatorial games
  • Exact algorithms for specific classes of positions
  • A hypothesis about similarities between losing positions in Chomp and primary numbers

Upon purchase, you can access the Chomp and iChomp mini-courses by signing in and choosing Chomp and iChomp in the Games menu. On these pages, the mini-courses are in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French, Persian, and Mandarin.

This purchase gives an Individual access to GeomeTree for the duration of the current Caribou Cup (1 July - 30 June) :

  • 56 interactive geometry worksheets grouped into 9 categories
  • Curriculum material, interactive constructions as well as formula discovery and proofs
  • Progressive content suitable for elementary, middle, and high school students
  • Worksheets are organized in a tree of dependencies to guide students through a structured and consistent experience of learning and discovery
  • Each worksheet has an introduction, guided interactive construction, a summary page and a quiz
  • Interested students can tackle challenges beyond the school curriculum including the geometry of playing Billiards, the construction of 72°, 36°, 18°, 9° angles, constructing a pentagon and a 17-gon
  • No prerequisites are required

Upon purchase, you can access GeomeTree by signing in and choosing GeomeTree in the Games menu.

This purchase gives an Individual access to the Mazes tutorial for the duration of the current Caribou Cup (1 July - 30 June) :

  • These are typical mazes fulfilling two simple conditions :
    1. any two points can be linked, and
    2. there is no closed path
    Despite its generality, this class of mazes has remarkable properties.
  • First the tutorial explains useful notations, then the reader is guided in the discovery of the 6 magic points in every maze and using these points to find the solution.
  • 30 progressive questions with illustrated examples that give the reader understanding of the global structures which characterize these mazes.

Upon purchase, you can access the Mazes tutorial by signing in and choosing Mazes in the Games menu. The tutorial is in the "Some Food for Thought" section at the bottom of the page.

This product is also available in French and in Persian.

This purchase gives an Individual access to the Proof by Induction site for the duration of the current Caribou Cup (1 July - 30 June) :

  • Through a simple step-by-step example, the reader learns how to apply the proof by induction technique.
  • Then, the reader can practice applying this technique by performing 46 different proofs by induction for summation rules, product rules, theorems about divisibility and Fibonacci sequences.
  • All proofs can be followed step-by-step in an example mode then performed interactively by the user.
  • This unique learning tool allows the user complete freedom in how they formulate each proof.
  • Each step is checked by an automatic proof verification system.
  • At the end, the user can print a copy of their own proof or have it emailed to them.

Upon purchase, you can access the Proof by Induction site by signing in and choosing Induction in the Games menu.

This product is currently only available in English.

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Purchasable For Entire School

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Purchasable For Contact

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