Description
Arthur Benjamin's brilliant, accessible guide to the mental calculation techniques that allow trained mathematicians to perform extraordinary arithmetic entirely in their heads—squaring large numbers, calculating complex multiplications, and extracting roots without a calculator—makes these remarkable skills genuinely learnable by anyone willing to practice the methods he presents. Written with the enthusiasm and the genuine pedagogical gift of one of the world's most celebrated mathematical performers, this is essential reading for every person who wants to expand their relationship with numbers. A genuinely useful and genuinely exciting guide.
