The Trachtenberg Speed System of Basic Mathematics
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.
Auteur | | Jakow Trachtenberg |
Taal | | Engels |
Type | | E-book |
Categorie | | Wetenschap & Natuur |