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The Mental Calculator's Handbook By Robert Fountain, Jan van Koningsveld
Paperback: $32.96
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(2 Ratings)
Written by two of the world’s foremost authorities on mental calculation, The Mental Calculator’s Handbook is essential reading for aspiring calculating prodigies. From multiplying... More > fractions to extracting square roots, all the techniques are presented and explained in a clear and rigorous way.< Less