# Multiplication Strategies--Doubling

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

Multiplication Facts

# Multiplication Strategies--Doubling

Created 3 years ago

Duration 0:02:09
95
Explains how to use the doubling strategy for x2, x4 and x8 multiplication facts.
Slide Content
1. ### 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