Foreword by Bill Nye

Foreword by Bill Nye

Foreword by Bill Nye

Foreword by Bill Nye

Best Seller

“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.”

“The clearest, simplest, most entertaining, and best book yet on the art of calculating in your head.”

“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.”

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