Secrets of Mental Math Calculation Guide

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Editor's Pick: This compact book teaches practical mental math and speed calculation techniques, from two-digit multiplication to square root calculations. Follow the methods in the book and you'll quickly get the hang of it. The author is a professional "math magician," and the explanations are down-to-earth and far from boring. Flip through a few pages while waiting for the bus or in line—doing a little number crunching on the go keeps your brain sharp.