ISBN/ASIN: 0486246116,9780486246116 | 1984 | English | epub | 112/0 pages | 4.30 Mb
Publisher: Dover Publications | Author: Gerard W. Kelly | Edition: Revised
Clear, concise compendium of about 150 time-saving math short-cuts features faster, easier ways to add, subtract, multiply, and divide. Each problem includes an explanation of the method, a step-by-step solution, the short-cut solution, and proof, as well as an explanation of why it works. No special math ability needed.