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The Trachtenberg Speed System of Basic Mathematics
Hardcover
ISBN13: 9780313232008
Publisher: Praeger
Published: Feb 4 1982
Pages: 272
Weight: 0.93
Height: 0.94 Width: 5.79 Depth: 8.59
Language: English
The complete system of the Trachtenberg method of mathematics which makes possible high-speed arithmetical calculations with a remarkable degree of accuracy.
This method is not only speedy but simple. Once one has mastered the rules, lightning calculation is as easy as reading a story. It looks like magic, but the rules are based on sound logic.Also in
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