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Think Like A Maths Genius: The Art of Calculating in Your Head by Arthur Benjamin, Michael Shermer (Paperback, 2006)
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£11.14
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30 days return. Buyer pays for return postage.
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How to calculate almost anything in your head. Did you know that it's easier to add and subtract from left to right, rather than the other way round?. You can be taught to square a three-digit number in seconds.