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The Trachtenberg Speed System of Basic Mathematics

The Trachtenberg Speed System of Basic Mathematics
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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.
Souvenir Press; January 2011
272 pages; ISBN 9780285639959
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