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The Trachtenberg Speed System of Basic Mathematics - Trachtenberg, Jakow, and Cutler, Ann (Translated by), and Sloan, Sam (Introduction by)
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Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System. Ever find yourself struggling to check a bill or a payslip? 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. Using a series of simplified keys it allows anyone to master calculations, giving greater speed, ease in handling numbers and increased accuracy. Jakow Trachtenberg believed that everyone is born with phenomenal ...

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The Trachtenberg Speed System of Basic Mathematics 2011, Ishi Press

ISBN-13: 9784871877091

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The Trachtenberg Speed System of Basic Mathematics 1989, Souvenir Press Ltd

ISBN-13: 9780285629165

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