Quick(er) calculations : how to add, subtract, multiply, square, and square root more swiftly / Trevor Davis Lipscombe.
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, multipl...
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