Think of a number between 20 and 100. Then add the digits together. Now subtract the total from your original number. Finally, add the digits of the new number together.
Your answer is 9, right? It’s Always 9!
America’s greatest “mathemagician” uses magic tricks and fun, everyday examples to teach math’s classic problems
America’s Best Math Whiz by Reader’s Digest, one of America’s 300 Best Professors by Princeton Review and three-time TED talker with more than 11 million views.
“Mathematics is filled with magic like this, but most of us are never exposed to it in school,”
–mathemagician Arthur Benjamin.
Blending magic with lightning-fast mental math feats, mathemagician Arthur Benjamin has been dazzling, entertaining, and inspiring audiences of all ages with his mathematical magic shows for more than thirty years. In his new book, he draws on his sense of humor and a delightful assortment of tricks, mental shortcuts, and examples to explain the beauty, simplicity, and truly magical properties behind some of math’s most well-known formulas and properties. “While math is a seriously important subject, it doesn’t have to be taught in a serious and dry fashion,” he writes.
About the Author: Arthur Benjamin holds a PhD from Johns Hopkins University and is the Smallwood Family Professor of Mathematics at Harvey Mudd College. Dr. Benjamin has received numerous awards for his writing and teaching, and served as editor of Math Horizons magazine for the Mathematical Association of America. He has given three TED talks, which have been viewed over 10 million times. Reader’s Digest calls him “America’s best math whiz.” Benjamin has appeared on numerous television programs, including Today, The Colbert Report, and The Queen Latifah Show. He and his work have also been featured in the New York Times, Los Angeles Times, USA Today, People Magazine, and Wired, among others.The author of Secrets of Mental Math, he lives in Claremont, California, with his wife and two daughters.