This new, revised edition of the bestselling Speed Mathematics features new chapters on memorising numbers and general information, calculating statistics and c

Entertaining, easy-to-follow suggestions for developing greater speed and accuracy in doing mathematical calculations. Surefire methods for multiplying without

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 Tra

A number sense approach to the four basic operations of arithmetic together with fractions and decimals

An antidote to mathematical rigor mortis, teaching how to guess answers without needing a proof or an exact calculation. In problem solving, as in street fighti