Book description
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.
Jacob Trachtenberg was born in 1888 and invented his system of mental
mathematics while imprisoned in a Nazi concentration camp during WW2 and
founded the Mathematical Institute in Zurich in 1950 to teach his new
method of understanding mathematics.
