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The Mental Calculator's Handbook Contact Current vs Body Voltage ÒIn these days where peopleWritten by two of the worlds foremost authorities on mental calculation, The Mental Calculators Handbook is essential reading for aspiring calculating prodigies. From multiplying fractions to extracting square roots, all the techniques are presented and explained in a clear and rigorous way., mental calculation, arithmetic, mathematics, numbers, Robert Fountain 9781300846659 498PAGES