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mental arithmetic

A random factoid from Cheaper by the Dozen: Also of exceptional general interest was a series of tricks whereby Dad could multiply large numbers in his head, without using pencil and paper. The explanation of how the tricks are worked is too complicated to explain in detail here, and two fairly elementary examples should suffice. […]

dad had enough gall to be divided into three parts

On Mary Poppendieck‘s recommendation, I’m reading Cheaper by the Dozen. Two paragraphs into it and I’m already a fan!