Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply and Divide without a Calculator (Paperback) - Common

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.