STRATEGIES FOR MULTIPLICATION by lL4X730

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									          STRATEGIES FOR
          MULTIPLICATION

•   COMPLETE NUMBER STRATEGIES
•   PARTITIONING STRATEGIES
•   COMPENSATION STRATEGIES
•   USING MULTIPLES OF 10 AND 100
•   TWO DIGIT MULTIPLIERS (The area model)
        COMPLETE NUMBER
          STRATEGIES
Repeated addition: 73 X 4 =
  73
+ 73                73
 146                73      146
+ 73                73
 219                73      146   292
+ 73
 292
  PARTITIONING STRATEGIES
• Breaking numbers up in a variety of
  ways that reflect an understanding of
  base 10.
27 X 4              268 X 6
20 X 4 = 80         200 X 6 = 1200
 7 X 4 = 28          60 X 6 = 360
        108           8 X 6 = 48
                              1608
  COMPENSATION STRATEGIES

Looking for strategies to manipulate
numbers so the calculations are easier
(more familiar).

Double/Half:                27 X 4
3 X 18                      30 X 4 = 120
(3 X 2) X (18 / 2)         - 3 X 4 = 12
   6 X 9                             108
    TWO DIGIT MULTIPLIERS
       (The area model)
See Board

								
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