Can you multiply 5132437201 by 452736502785 in 70 seconds without reaching for your calaulator? Well you could if you used the techniques in this revolutionary book for high-speed multiplication, division, addition, subtraction and square root. 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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