Trachtenberg Geschwindigkeitssystem der grundlegenden Mathematik, Taschenbuch von Trachtenberg, Ja...
13,67 €
Trachtenberg Speed System of Basic Mathematics, Paperback by Trachtenberg, Jakow; Cutler, Ann (TRN); McShane, Rudolph (TRN), ISBN 0285629166, ISBN-13 9780285629165, Brand New, Free P&P in the UK 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 '
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