Scientific American presents Math Dude by Quick & Dirty Tips. Scientific American and Quick & Dirty Tips are both Macmillan companies. After all of the fun we’ve had recounting the tales of Knot Dude, ...
Quick: What's 19 2...without your calculator? (361.) Squaring complex, two-digit numbers in your head isn't that difficult if you know a simple trick, according to the Secrets of Mental Math author ...
Math Riddles: This is a Magic Square. Only 1% of people with a high IQ can find the missing numbers in this tricky logic magic square puzzles in 20 seconds. Math Riddles are so challenging, but that ...
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