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.
; January 2011
272 pages; ISBN 9780285639959Read online
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Title: The Trachtenberg Speed System of Basic Mathematics
Author: Jakob Trachtenberg
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