Strategies for Remembering Factor Pairs

1
Strategies for Remembering Factor Pairs
2
These factor pairs are hard to remember

• 8 x 7
• 7 x 6
• 9 x 6
• 8 x 9

3
Strategies for remembering difficult factor pairs

• Half and double.
• Combine two known factor pairs
• Count up or down from a known factor pair
• Skip Count

4
Half and Double

• Look at 6 X 7.
• 3 X 7 21
• So double 21 to get 6 X 7
• 6 X 7 42

5
Combine two known factor pairs

• Look at 9 X 6
• 5s are easy to remember.
• Start at 5 X 630, and then add 4 X 6 24. 30
  24 54

6
Count up or down from a known factor pair

• Look at 8 X 9.
• 8 X 10 is 80
• Simply take 8 away from 80
• 8 X 9 is 72.

7
Skip Count

• Look at 8 X 7
• Skip count by 8 to find 7 8s.
• 8, 16, 24, 32, 40, 48, 56