Format
Häftad
Sidor
272 sidor
Språk
Engelska
Utgiven
juni 1989
Jämför priser
Från 159 kr159 kr
166 kr
166 kr
Priserna uppdateras löpande från säkra och trygga butiker.
Om boken
Do high-speed, complicated arithmetic in your head using the Trachtenberg Speed System. 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. 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.
Fler böcker av Jakow Trachtenberg
Liknande böcker
Alla i Naturvetenskap och teknikBästa pris159 kr
Gå till butik