Posted by: ctal December 18, 2008
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I don't know what is hidden behind this guy's magic. But, there a book - Vaidic Mathematics. It is based on ancient mathematics and perhaps written by Sukracharya. There you find many short cut way of multiplying any number by any number by your mind without any need of pen and paper within 5-10 seconds. Not only the multiplication, but also the division, addition, substraction were just a matter of few seconds using the logics used in the book.