Comparison Sentences
Multiply with 0s
Estimate
Use distributive property to multiply
Standard Algorithm
100

28 is 4 times as many as 7

28 = 7 x 4

100

3,000 x 1 =

3,000

100

5 x 62 =

300

100

3 x 14 =

3 x 10 = 30

3 x 4 = 12

30 + 12 = 42

100

3 x 64 =

192

200

40 is 8 times as many as 5

40 = 5 x 8

200

4 x 200 =

800

200

2 x 903 =

1,800

200

18 x 9 = 

10 x 9 = 90

8 x 9 = 72

90 + 72 = 162

200

5 x 238 = 

1,190

300

60 = 10 x 6

60 is 6 times as many as 10

300

6 x 90 =

540

300

7 x 3,592

28,000

300

487 x 3 =

400 x 3 = 1,200

80 x 3 = 240

7 x 3 = 21

1,200 + 240 + 21 = 1,441

300

6 x 746

4,476

400

72 = 8 x 9

72 is 9 times as many as 8

400
5 x ___ = 450

90

400

Find two products in between

4 x 284

4 x 200 = 800

4 x 300 = 1,200

400

5 x 7,042 = 

5 x7000 = 35,000

5 x 400 = 2,000

5 x 2 = 10

37,010

400

4 x 3,426

13,704

500

Your friend is 10 years old. Your neighbor is 4 times as old as your friend. How old is your neighbor?

4 x 10 = 40

500

5 x 400 =

2,000

500

Find two products in between 

6 x 4, 732 =

6 x 4,000 = 24,000

6 x 5,000 = 30,000

500

8,395 x 7 =

8,000 x 7 = 56,000

300 x 7 = 2,100

90 x 7 = 630

5 x 7 = 35

58,765

500

7,605 x 8 =

60,840

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