Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator

EDWARD H. JULIUS, CPA, a graduate of Rutgers and the Wharton School, is an award-winning professor of business administration at California Lutheran University. He is the author of many books; his math titles include Rapid Math Tricks and Tips and Rapid Math in 10 Days. His lectures and workshops on rapid math are popular with young people and adults alike.