How to add, subtract, multiply, divide, square, and square root more swiftly
Description
How fast can you calculate? Would you like to be faster? This book presents the time honored tricks and tips of calculation, from a fresh perspective, to boost the speed at which you can add -- whether a couple of numbers, or columns so long an accountant may faint. Find out how to subtract, multiply, divide, and find square roots more quickly.
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'Quick(er) Calculations - Lipscombe, Trevor Davis (Director'.
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