How to perform feats of MATHEMATICAL WIZARDRY! They'll marvel at your amazing number tricks, games, lightning calculation, your magical knowledge. They'll think you're a genius! You are going to love the things this book will teach you. Absolutely nothing to carry, no gimmicks! Just great number magic. These are, anywhere, anytime, on the spot number miracles. Sample Effect: A member of the audience multiplies two 3-digit numbers together, and then reads you every digit in the answer except for one of them, and you can instantly name the missing digit! (This can be done as a mind reading, a memory or a lightning calculation feat). And, that's only one of so many amazing, mind-blowing feats of lightning calculation. Harry's selected only the most entertaining effects. He's also introduced new touches to improve presentation for many familiar routines. Armed with this book you can become the "life of the party" with just paper, a pen, and a calculator. Harry has collected this stuff since childhood, and culled out only the best of the best. You'll instantly square any 2-digit number; add columns of numbers at a glance; prove that your mind is the best and fastest machine out there, by multiplying and dividing faster than a calculator can. Harry Lorayne is the recipient of these awards: Literary Fellowship Award--Magic Castle 1981, The Stars of Magic Award--International Brotherhood of Magicians 1975, Magician of the Year Award--Society of American Magicians 1983, Lifetime Achievement Award--Society of American Magicians 1994, "For His Outstanding Contribution to Close-Up Magic"--FFFF Convention 1991. "Your writings contain marvelous things."--Johnny Carson. "I was never good at arithmetic. Then I read Harry Lorayne's Mathematical Wizardry. Now, unbelievably, I can amaze my friends with my fantastic lightning calculation tricks--and more! Thank you, Harry."--Mel Brooks. "Harry: Thank you. I love watching and learning. You're the best."--Steve Martin. "Being a fan of magic, I'm a fan of yours."--Woody Allen.