The Trachtenberg Speed System of Basic Mathematics
Jakow Trachtenberg
- 01 maart 2011
- 9780285639959
Samenvatting:
Jakow Trachtenberg believed that everyone is born with phenomenal abilities to calculate, he devised a set of rules that allows every child to make multiplication, division, addition, subtraction and square-root calculations with unerring accuracy and at remarkable speed.
€ 7,49
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