50 Easy Ways to Add, Subtract, Multiply, and Divide Without A CalculatorBook - 1995
Packed with 50 tricks and tips that let you add, subtract, multiply, and divide in a flash, ARITHMETRICKS makes math easier and more fun than you've ever imagined. You won't need a calculator, or in many cases even a pencil, to come up with the correct answers. Just a few simple shortcuts will have you solving basic problems in record time.
Publisher: New York : Wiley, c1995
ISBN: 0471106399 (pbk. : acid-free paper)
Branch Call Number: 513.9 JUL
Characteristics: xiii, 142 p. : ill. ; 23 cm