Tag Archives: Numbers puzzles

Puzzle #76: What’s The Final Digit?

Posted on September 27, 2014 by Alok Goyal

A beautiful puzzle for ages 10-100! Found this in Mathematical Circle Diaries, Year 1 (for grade 5-7), Session 25, problem #8. Robby the Robot multiplied the numbers from 1 to 100 (100 factorial) and calculated the sum of the digits … Continue reading →

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Solution to Puzzle #73: Find the Two Numbers

Posted on September 7, 2014 by Alok Goyal

This was a difficult puzzle. Many people sent me the answers, though none of them were completely correct. One grade 11 student sent me the correct answer but the reasoning was not completely correct. So unfortunately no names on the … Continue reading →

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Solution to Puzzle #68: Number at the Intersection

Posted on July 27, 2014 by Alok Goyal

The response to this puzzle was overwhelming…got many correct answers. First one to respond with the right answer was Anavi Baddepudi from Singapore – well done. Many others got correct answers – Pratik Sarkar, Vivek Shah, Ramendra Mandal, Anubhav Garg, … Continue reading →

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Puzzle #68: Number At The Intersection

Posted on July 20, 2014 by Alok Goyal

This is a very nice, quick teaser I got from the site brilliant.org. Should be fun to do for the younger lot, no specific knowledge required for this one. Place integers from 1 to 9, once each, into the 9 … Continue reading →

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Solution to Puzzle #65: The On-Off Game

Posted on July 6, 2014 by Alok Goyal

Welcome back…I was traveling for a month and hence no posts…but normal service resumes! I got many answers to this puzzle, and most of them correct. While I had done this myself, I got a nice and easy explanation for … Continue reading →

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Puzzle #65: The On-Off Game

Posted on May 31, 2014 by Alok Goyal

This is a relatively common puzzle and available in many puzzle books. Interesting one, good to try with kids. There are 100 light switches, all of them are off. First, you walk by them, turning all of them on. Next, … Continue reading →

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Solution to Puzzle #63: The Funny Equation

Posted on May 24, 2014 by Alok Goyal

Thanks for a great response…got many correct answers, including some first timers. Anirudh Baddepudi was the first one to come back with the correct answer. Also had correct answers from Adila Sebastian, Rajesh Thakur, Anshu Goyal and Anubhav Gupta. Correct … Continue reading →

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Puzzle #63: The Funny Equation

Posted on May 17, 2014 by Alok Goyal

Great small numbers puzzle for children! I found this one in a new book that I bought last week “World’s Toughest Puzzles” by Charles Barry Townsend. Puzzles are not as tough as the name of the book suggests 🙂 One … Continue reading →

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Puzzle #61: How Many Pearls

Posted on May 4, 2014 by Alok Goyal

This is a simple puzzle, and would love for children to try it! I picked this up from a new website recommended to me by my wife – Brilliant.org…has a great selection of puzzles. This specific puzzle was posted by … Continue reading →

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Puzzle #47: Each Digit Only Once

Posted on January 11, 2014 by Alok Goyal

Got this puzzle from my cousin sister (Ankita) and her husband (Mohit) who live in Seattle and are both very smart puzzlers. Found it to be very intriguing and in full transparency, have not solved it yet. So I will … Continue reading →

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