The Trachtenberg Speed System of Basic Mathematics - Hardcover

by Ann Cutler (Translator), Rudolph McShane (Translator), Rudolph Matas McShane (Photographer)

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.