- Trachtenberg Technique v2
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- Listat: 0 + 0 Rankingissa: 0 Arvostelut: 0
- Pisteet: 0 + 0 Versio: 7.0 The Trachtenberg system v2 is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations ... ⥯
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