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The Trachtenberg Speed System of Basic Mathematics
$136.08 USD
$123.33 USD
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ISBN: 0313232008
Author: Jakow Trachtenberg
Condition: New
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.
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The Trachtenberg Speed System of Basic Mathematics
$136.08 USD
$123.33 USD