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Jakow Trachtenber The Trachtenberg Speed System of Basic Mathematic (Paperback) - Picture 1 of 1

The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg (Paperback, 1989)

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Author: Jakow Trachtenberg. With The Trachtenberg Speed System you can. Described as the 'shorthand of mathematics', the Trachtenberg system only requires the ability to count from one to eleven. He devised a set of rules that allows every child to make multiplication, division, addition, subtraction and square-root calculations with unerring accuracy and at remarkable speed.