Short-Cut Math - Kelly, Gerard W

Clear, concise compendium of about 150 time-saving math short-cuts features faster, easier ways to add, subtract, multiply, and divide. Each problem includes an explanation of the method. No special math ability needed.

Short-Cut Math 2012, WWW.Snowballpublishing.com

ISBN-13: 9781607964391

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Short-Cut Math 1984, Dover Publications, New York, NY

ISBN-13: 9780486246116

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