Category Archives: Puzzles

Puzzle #89: Chameleons on an Island

Posted on January 26, 2015 by Alok Goyal

This is a very sweet puzzle I picked up from Gurmeet’s puzzles at http://gurmeet.net/puzzles/ (Thank you Gurmeet for such a wonderful collection of puzzles!). I tried this on a train ride with my two daughters, and my younger one (now 8 … Continue reading →

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Puzzle #88: Ken Ken Puzzles

Posted on January 10, 2015 by Alok Goyal

Thanks to Alok Mittal for introducing me to Ken Ken puzzles through his Mathematical Circle classes – I spent a good chunk of my last week trying to solve the Ken Ken puzzles. Liked them so much, that I thought … Continue reading →

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Puzzle #87: The Magic Triangle (Challenge Puzzle!)

Posted on December 31, 2014 by Alok Goyal

Hope you all had a great year and may 2015 be a less puzzling year than 2014! Ending the year with a difficult puzzle, to which I do not know the solution. This is a challenge puzzle, i.e., the first … Continue reading →

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Puzzle #86: Add The Digits And Count

Posted on December 13, 2014 by Alok Goyal

I found this beautiful puzzle on Brilliant.org very recently. A very different kind of puzzle, requires basic knowledge of combinatorics. I have also created a couple of simpler versions so that children can also attempt it. Original Problem: How many integers … Continue reading →

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Puzzle #85: Colliding Ants

Posted on December 7, 2014 by Alok Goyal

Very nice puzzle from gurmeet.net/puzzles, which has a great set of puzzles on the site. I am taking a puzzle from this site after a long time. This puzzle should be interesting for children as well as adults. Peter and … Continue reading →

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Puzzle #84: Reason Without Equations

Posted on November 29, 2014 by Alok Goyal

Two very cute number problems I found which can be solved without any equations. If adults are trying it, they should keep a time limit of 2 minutes, though children are free to take as much time as they need. … Continue reading →

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Puzzle #83: Belleview and Hillview Distance

Posted on November 23, 2014 by Alok Goyal

This is a beautiful puzzle for children from the book Mathematical Circle Diaries, Year 1 (Session 22, last puzzle). Two mountain villages, Belleview and Hillview, are connected by a road. Not a single stretch of this road is flat: the … Continue reading →

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Puzzle #82: Guess The Number

Posted on November 15, 2014 by Alok Goyal

Thanks to Nandini Dube for contributing this puzzle. She is a class V student in New Jersey, and this is a homework puzzle from her class. Please do not be swayed by “Class V” tag, this is a puzzle worth … Continue reading →

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Puzzle #81: The “Sholay” Puzzle

Posted on November 9, 2014 by Alok Goyal

A very interesting probability/ strategy puzzle for children, coming straight out of the movie Sholay, one of the most popular Bollywood movies of all time. All the Indians reading this blog I am sure will vividly remember the scene where … Continue reading →

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Puzzle #80: The Bored Guards

Posted on November 3, 2014 by Alok Goyal

This is a beautiful puzzle from the book “Mathematical Circle Diaries, Year 1” by Anna Burago (Chapter 9, last puzzle). For parents of middle school children, this is a highly recommended book. At midnight, six guards assume their positions at … Continue reading →

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