Review
A great introduction to the wonder of numbers, from two superb teachers. -- Brian Greene, author of The Elegant Universe
A magical mystery tour of mental mathematics! Fascinating and fun. -- Joseph Gallian, president of the Mathematical Association of America
The clearest, simplest, most entertaining, and best book yet on the art of calculating in your head. -- Martin Gardner, author of Mathematical Magic Show and Mathematical Carnival
This book can teach you mental math skills that will surprise you and your friends. Better, you will have fun and have valuable practical tools inside your head. -- Dr. Edward O. Thorp, mathematician and author of Beat the Deale r and Beat the Market