Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator
Become a mental-math master and astound your friends, family, and teachers with . . ."A fascinating and useful book. I recommend it." --Jaime Escalante (of Stand and Deliver fame) Hiram W. Johnson High School will fascinate students of all ages. A resource 'must' for all math programs." --Howard Wang, Founding Director of Sierra Canyon College Preparatory School More »