Multiplication StrategiesDoubling
Created 3 years ago
Duration 0:02:09
95
Explains how to use the doubling strategy for x2, x4 and x8 multiplication facts.

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Multiplication Facts

Slide 1  Multiplication Strategies—Doubling
 for x2, x4 and x8
 For multiplying by 2 simply double the other factor
 For multiplying by 4 double the double. In other words you double the other factor twice.
 To multiply by 8 double the double the double. In other words double the other factor three times.
 For 2 x 8 think
 8 doubled is 16
 So 2 x 8 = 16
 For 2 x 9 think
 9 doubled is 18
 So 2 x 9 = 18
 For 4 x 7 think
 7 doubled is 14
 14 doubled is 28
 So 4 x 7 = 28
 For 4 x 3 think
 3 doubled is 6
 6 doubled is 12
 So 4 x 3 = 12
 For 8 x 7 think
 7 doubled is 14
 14 doubled is 28
 28 doubled is 56
 So 8 x 7 = 56
 For 8 x 6 think
 6 doubled is 12
 12 doubled is 24
 24 doubled is 48
 So 8 x 6 = 48