The Trachtenberg Speed System of Basic Mathematics ePub (Adobe DRM) download by Jakob Trachtenberg

The Trachtenberg Speed System of Basic Mathematics

Souvenir Press
Publication date: January 2011
ISBN: 9780285639959
Digital Book format: ePub (Adobe DRM)

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Jakow Trachtenberg believed that everyone is born with phenomenal abilities to calculate, 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.
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