Sunday's New York Times has a bunch of magic tricks based on simple algebra, by Arthur Benjamin.
For some magic tricks based on "deep" mathematics, check out this mathoverflow thread. Rumor has it that Persi Diaconis thinks there's no such thing, though, and he would know.
A random walk through mathematics -- mostly through the random part.
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3 comments:
My students are easy to fool. They let me calculate: x/5 - x/2 = x/(5-2) = x/3 and when it doesn't get the textbook answer they are amazed.
Take a number. Square it. Drop all but the last digit. Square that. Drop all but the last digit. Multiply by the original number.
Declare the result. I can guess the number.
(unless you picked something that ends with a zero, but that doesn't happen much).
Cute application of Fermat's Little Theorem. A little math magic
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