October 2007
Beginner
627 pages
15h 41m
English
book
Mastering Technical Mathematics, Third Edition, 3rd Edition
by Stan Gibilisco, Norman H. Crowhurst
Content preview from Mastering Technical Mathematics, Third Edition, 3rd Edition
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| 3 | Multiplication |
Suppose you go into a store and buy seven articles for $1.00 each. The total cost is $7.00; you count $1.00 seven times. What if the articles cost $3.00 apiece? In that case, to find the total, you must count $3.00 seven times. This type of problem leads to the next step in calculating: multiplication.
IT’S A SHORTCUT
Multiplication is a shortcut for repeated addition. At one time, children learning arithmetic memorized huge multiplication tables without knowing why they’d ever need such facts. If you memorized, say, 7 times 3 is 21 (written 7 × 3 = 21), you could do calculations more quickly than if you had to go to a table and look up every multiplication fact. But not many people could tell you the reason why 7 × 3 = 21! ...
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