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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.
- Format: Inbunden
- ISBN: 9780313232008
- Språk: Engelska
- Antal sidor: 272
- Utgivningsdatum: 1982-02-04
- Förlag: Bloomsbury Publishing Plc