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The Trachtenberg Speed System of Basic Mathematics
The Trachtenberg Speed System of Basic Mathematics
Author: Ann Cutler
"This revolutionary new system makes possible high-speed arithmetical calculations with a remarkable degree of accuracy. There are no multiplication tables and no long division as we know it. To add long columns of numbers we need not count higher than eleven. In fact one only needs to be able to count to eleven to master the entire system. Once...  more »
ISBN: 299786
Publication Date: 1965
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Publisher: Pan Books
Book Type: Paperback
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