Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator
by Edward H. Julius
ISBN 13: 9780471106395
Format: Illustrated (160 pages) Publisher: Jossey-Bass Published: 14 Jul 1995
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Rapid Math Tricks & Tips: 30 Days to Number Power
ISBN 13: 9780471575634
Format: Paperback (240 pages) Publisher: Wiley Published: 04 Apr 2013