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$5.95The Story
From a renowned Mathemagician, a fun, accessible, and comprehensive guide to the simple techniques of doing quick calculations in your head, including addition, subtraction, multiplication and division of large sums, square roots, ''psychic math'' tricks, and memory tips.
Description
From a renowned Mathemagician, a fun, accessible, and comprehensive guide to the simple techniques of doing quick calculations in your head, including addition, subtraction, multiplication and division of large sums, square roots, ''psychic math'' tricks, and memory tips.
