Mathematical Magic

Published by CHIU Ho Keung in Science
May 11, 2009
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Occult Numbers: Calculate your age, birthday or test mark without asking you directly. You just need to answer me yes or no.

1/120 or 1/720?

Published by CHIU Ho Keung in Science
April 17, 2009
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How big is the chance to hit a lottery? Not few students made a similar mistake for this question.

Two Right Angles Each Hour

Published by CHIU Ho Keung in Offbeat
April 13, 2009
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There are two right angles formed by the hour and minute hands each hour. Do you ever notice that on a clock? three o’ clock and nine o’ clock are greedy to have three.

Math Puzzle

Published by razorsharp1 in Quizzes
January 21, 2009
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A math puzzle I made up while on a plane to Chicago.

Three Time Travel Trips: A Response to the Challenge Set by S Hayes

Published by Gary Wallace in Travel
November 23, 2008
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A few days ago, S Hayes asked an interesting question. Equipped with a time machine that can only visit the past, and only allowed three trips, where and when would you go? The following are my choices.

The Trickiest and Most Mind-twisting Mathematics Questions

Published by CHAN LEE PENG in Quizzes
October 22, 2008
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How good is your math? Are you up for a challenge? Try solving these riddles.

Tricky Math Quiz for All

Published by excellentvision in Kids
October 31, 2007
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Here’s a math quiz that has surprisingly tricked many people. It is really funny if you give the wrong answer!