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The Trachtenberg Speed System of Basic Mathematics Ann Cutler
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発送予定日 年11月2日 - 年11月12日
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The Trachtenberg Speed System of Basic Mathematics
Ann Cutler
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. It looks like magic, but the rules are based on sound logic.
272 pages
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