Wednesday, August 5, 2009

How to Calculate Quickly

8/05/2009 09:23:00 PM |

Many useful procedures explained and taught: two-column addition, left-to-right subtraction, direct multiplication by numbers greater than 12, mental division of large numbers, more. Also numerous helpful short cuts. More than 8,000 problems, with solutions.

http://rapid* to Calculate Quickly.rar

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