Chapter 4 Review

Multiplication Patterns

100

20 X 30

600

200

400 X 20

8000

300

2400 X 60

144000

400

540 X 700

378000

500

8970 X 500

4485000

Front-end Estimation

100

60 X 20

1200

200

50 X 70

3500

300

450 X 800

320000

400

700 X 80

56000

500

940 X 800

720000

2/3/4-digit by 1-digit Multiplication

100

23 X 2

46

200

444 X 7

3,108

300

397 X 5

1,985

400

8,119 X 9

73,071

500

4,372 X 6

26,232

2-digit by 2-digit Multiplication

100

23 X 13

299

200

42 X 12

504

300

57 X 19

1083

400

34 X 93

3162

500

67 X 58

3886

3-digit by 2-digit Multiplication

100

201 X 44

8844

200

132 X 23

3036

300

841 X 56

47,096

400

634 X 84

53,256

500

837 X 79

66,123