How Can You Use Patterns to Multiply by 2 and 5?

How many socks are in 7 pairs of socks?

• 14

• 10

• 12

• 16

How many fingers are on 7 gloves?

• 35

• 28

• 30

• 40

Find 7 x 2.

• 14

• 12

• 9

• 16

Find 7 x 5.

• 35

• 25

• 30

• 40

How many socks are in 9 pairs?

• 18

• 9

• 16

• 20

How many socks are in 10 pairs?

• 20

• 10

• 15

• 25

How many fingers are on 9 gloves?

• 45

• 40

• 50

• 36

How many fingers are on 10 gloves?

• 50

• 40

• 60

• 55

Using doubling, what is the result of 2 × 8?

• 16

• 10

• 12

• 18

Bert says 2 × 9 is 19. Which pattern shows that Bert’s answer is wrong?

• The pattern 2 × 8 = 16, so 2 × 9 should be 18, not 19.

• The pattern 2 × 10 = 22, so 2 × 9 should be 21.

• The pattern 2 × 7 = 15, so 2 × 9 should be 17.

• The pattern 2 × 9 = 19, so Bert is correct.