Tag Archives: numbers puzzle

Puzzle #176: Outsmart Your Teacher

Posted on April 16, 2017 by

This is a relatively simple puzzle from fivethirtyeight.com, a site from which I have posted many puzzles in the past. Variations of such puzzles have been posted in the past. I would encourage parents to try this with their children. … Continue reading →

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Solution to Puzzle #53: Make a Century

Posted on March 8, 2014 by

Addendum to the answer…Shruti Mittal sent 6 more correct asnwers – Well done Shruti!             (-1*2)-3-4-5+6*7+8*9=100           1+(2*3)+(4*5)+(-6+7)+(8*9)           1*(2+3)*4*5*(6-7)*(8-9)           1*(2+3)*Sqrt(4)*5*{-[(6-7)+(CubeRoot(8)-Sqrt(9)]}   … Continue reading →

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Puzzle #53: Make a Century!

Posted on March 2, 2014 by

Thanks to Alok Mittal for sharing this cute problem to which there are many answers…limited only by your creativity! Insert mathematical signs between digits 1,2,3,4,5,6,7,8,9 to make an expression that equals 100. The digits must remain in the same sequence. … Continue reading →

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Puzzle #50: Cat and Mouse Tale

Posted on February 1, 2014 by

This is a nice puzzle for children that I picked from the book “Moscow Puzzles” (Puzzle #88). See the figure below: Cat has decided to take a nap. He dreams he is encircled by 13 mice: 12 gray and 1 … Continue reading →

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Solution to Puzzle #49: The Absent Minded Bank Clerk

Posted on February 1, 2014 by

I surprisingly got much fewer responses than I expected, and in hindsight, the “two minute” qualifier probably scared people! Congratulations to Muskaan Mittal, a brilliant 9 year old, in being the first one to send the answer. Girish Tutakne and … Continue reading →

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Puzzle #49: Two Minute Test – The Absent Minded Bank Clerk

Posted on January 26, 2014 by

This is a simple gem I found again in a Martin Gardner book – More Mathematical Puzzles and Diversions, Chapter 14, Puzzle #8. I urge all the adults who try this puzzle to put this as a 2-minute challenge for … Continue reading →

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Solution to Puzzle #47: Each Digit Only Once

Posted on January 18, 2014 by

First of all, need to thank Ankita and Mohit again for the puzzle…wonderful one. Got lots and lots of answers, and as it turns out, there are quite a few answers. Proper treatment of the answer requires a video but … Continue reading →

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