The Trachtenberg Speed System of Basic Mathematics - Trachtenberg, Jakow
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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 '
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System.

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Produktbeschreibung
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 '
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System.
Autorenporträt
Jakow Trachtenberg