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Benjamin Arthur, Shermer Michael. Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing Math Tricks

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Benjamin Arthur, Shermer Michael. Secrets of Mental Math: The Mathemagician’s Guide to Lightning Calculation and Amazing Math Tricks
N.Y.: Three Rivers Press, 2006. — 305 p. — ISBN 0307338401, 9780307338402; eISBN 9780307347466
We need numbers—they’re part of our lives every day, and in ways we typically don’t even notice. Think about a conversation you had with a friend. To call, you needed a phone number, and the time you spent on the phone was measured in numbers of hours and minutes. Every date in history, including an impor- tant one like your birthday, is reckoned with numbers. We even use numbers to represent ideas that have nothing to do with counting.
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