Trachtenberg speed system of basic mathematics, paperback/jakow trachtenberg

Trachtenberg speed system of basic mathematics, paperback/jakow trachtenberg

3 stele / 1 voturi

First developed during WW2, the Trachtenberg speed system makes possible high-speed arithmetical calcula tions with a remarkable degree of accuracy.

The system has e ven been known to beat computer calculations - in some insta nces - in terms of speed.

58.95 Lei

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