Naturvetenskap och teknik

Trachtenberg Speed System of Basic Mathematics

av Jakow Trachtenberg

Utgiven av Profile Books Ltd

Format

Häftad

Sidor

272 sidor

Språk

Engelska

Utgiven

juni 1989

Jämför priser

Från 159 kr
Akademibokhandeln
Bästa pris
159 kr
Adlibris
166 kr
Bokus
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

Bästa pris159 kr
Gå till butik