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Houghton Mifflin Company
Quick and easy maths
This book is for the mathematician, not the magician. You may astound both yourself and your friends by your ability to multiply 64 x 19 or 288 x 12.5 in your head, but the short cuts described here are for practical use, not parlor tricks. The techniques depend on a grasp of basic mathematical principles rather than a memorization of endless tables and rules.
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