Secrets of Mental Math: The Mathemagician's Guide to Lightning Calculation and Amazing Math Tricks by Michael Shermer & Arthur Benjamin

Author:Michael Shermer & Arthur Benjamin [Shermer, Michael]
Language: eng
Format: epub, azw3, mobi
ISBN: 9780307347466
Publisher: Random House, Inc.
Published: 2008-06-02T22:00:00+00:00

The exact square root of 593,472 is 770.37 (to five places), so you’re pretty close. But you could have been closer, as the following trick demonstrates. Note that the first two digits, 59, are closer to 64 (8 × 8) than they are to 49 (7 × 7). Because of this you can start your guesstimation with the number 8 and proceed from there:

Just for fun, let’s do a real whopper—the square root of 28,674,529. This isn’t as hard as it might seem. Your first step is to round to the nearest large number—in this case, just find the square root of 29.

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