The Trachtenberg Speed System of Basic Mathematics

The Trachtenberg Speed System of Basic Mathematics

134,99 €

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...

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Produktbeschreibung

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.
Marke Praeger
EAN 9780313232008
ISBN 978-0-313-23200-8
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