The Trachtenberg Speed System of Basic Mathematics: System of Basic Math - Rilegato

Cutler, Ann; McShane, Rudolph

 
9780313232008: The Trachtenberg Speed System of Basic Mathematics: System of Basic Math

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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.

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Book by Jakow Trachtenberg

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