Литмир - Электронная Библиотека
Trachtenberg Speed System of Basic Mathematics
Author:Trachtenberg Jakob (EN)
Language of a book: Английский
Language of an original book: Английский
Publisher: Gardners Books

    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.

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