Tag Archives: Numbers puzzles

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 →

Posted in Puzzles | Tagged , | Leave a comment

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

Posted on January 10, 2015 by Alok Goyal

A very happy new year to all readers and thank you for a wonderful response to the blog overall and this puzzle in specific. Last year people from exactly 100 different countries accessed these puzzles – thank you all! This … Continue reading →

Posted in Solution | Tagged , | Leave a comment

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 →

Posted in Puzzles | Tagged , | Leave a comment

Solution to Puzzle #86: Add The Digits and Count

Posted on December 31, 2014 by Alok Goyal

This was a difficult puzzle, and I got only one response and a correct one from Ganesh Ramani, my friend from IITD Comp Science and now in Tokyo – well done! To arrive at the solution, lets begin with Variation … Continue reading →

Posted in Solution | Tagged , , , | 1 Comment

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 →

Posted in Puzzles | Tagged , , | Leave a comment

Solution to Puzzle #84: Reason Without Equations

Posted on December 7, 2014 by Alok Goyal

Many people sent correct answers, which I had expected. However, very few sent the explanation behind the answers, which is what I was looking for. Some of you used equations to solve the question. Intent was to solve the questions … Continue reading →

Posted in Solution | Tagged , | Leave a comment

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 →

Posted in Puzzles | Tagged , | 2 Comments

Solution to Puzzle #82: Guess the Number

Posted on November 23, 2014 by Alok Goyal

I got many correct answers for this puzzle. The first one to send the correct answer was Sandeep Verma from California. I also got correct answers from my niece Radhika, and from Girish Tutakne and Anubhav Garg. I am reproducing … Continue reading →

Posted in Solution | Tagged , | Leave a comment

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 →

Posted in Puzzles | Tagged , | Leave a comment

Solution to Puzzle #76: What’s the Final Digit?

Posted on October 4, 2014 by Alok Goyal

I received an overwhelming number of correct responses to this puzzle…though very few from the younger ones. Ones who gave the correct answers included Pooja Goyal, Naresh Kumra, Smiti Mittal, Prakhar Prakash, Girish Tutakne, Ashutosh Diwakar, Aishvarya Gupta, Ashish Gupta, … Continue reading →

Posted in Solution | Tagged , | Leave a comment