- Start
- The Trachtenberg Speed System of Basic Mathematics
The Trachtenberg Speed System of Basic Mathematics
Angebote / Angebote:
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.
Folgt in ca. 15 Arbeitstagen
