vândut de libris.ro
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System. n n Ever find yourself struggling to check a bill or a payslip? With The Trachtenberg Speed System you can. Described as the shorthand of mathematics, the Trachtenberg system only requires the ability to count from one to eleven. Using a series of simplified keys it allows anyone to master calculations, giving greater speed, ease in handling numbers and increased accuracy. n n 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. It is the perfect way to gain confidence with numbers. n
Preț:
Vânzător: Libris.ro
Brand: Jakow Trachtenberg
