Multiplication Strategies--Doubling

Explains how to use the doubling strategy for x2, x4 and x8 multiplication facts.

Multiplication Facts
1.0x

Multiplication Strategies--Doubling

Created 2 years ago

Duration 0:02:09
lesson view count 89
Explains how to use the doubling strategy for x2, x4 and x8 multiplication facts.
Select the file type you wish to download
Slide Content
  1. Multiplication Strategies—Doubling

    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