Show:
Missing Factor
Area Model
Distributive Property
Standard Algorithm
Rounding
100

20 X __ = 160

8

100

Solve 12 X 62 using area model

744

100

Solve 22 X 33 using the distributive property

23 X 33

(20 + 2) X (30 + 3)

(20 X 30) + (20 X 3) + (30 X 2) + (3 X 2)

600 + 60 + 60 + 6

726

100

10 X 80

800

100

Estimate the product of 12 X 56 using rounding

10 X 60 = 600

200

30 X __ = 2,100

70

200

Solve 19 X 44 using area model

836

200

Solve 46 X 54 using the distributive property

46 X 54

(40 + 6) + (50 X 4)

(40 X 50) + (40 X 4) + (50 X 6) + (6 X 4)

2000 + 160 + 300 + 24

2484

200

19 X 32

608

200

Estimate the product of 28 X 72 using rounding.

30 X 70 = 2,100

300

40 X __ = 20,000

500

300

Solve 26 X 75 using area model

1,950

300

Solve 67 X 67 using the distributive property

67 X 67

(60 + 7) X (60 + 7)

(60 X 60) + (60 X 7) + (7 X 60) + (7 X 7)

3600 + 420 + 420 + 49

4489

300
43 X 85

2795

300

Estimate the product of 45 X 92 using rounding.

50 X 90 = 4,500

400

900 X __ = 81,000

90

400

Solve 25 X 78 using area model

1950

400

Solve 85 X 29 using the distributive property

85 X 29

(80 + 5) X (20 + 9)

(80 X 20) + (80 X 9) + (20 X 5) + (5 X 9)

1600 + 720 + 100 + 45

2465

400

55 X 77

4235

400

Estimate the product of 87 X 61 using rounding.

90 X 60 = 5,400

500

12 X __ = 144,000

12,000

500

Solve 39 X 89 using area model

3,471

500

Solve 12 X 89 using the distributive property

12 X 89

(10 + 2) X (80 + 9)

(10 X 80) + (10 X 9) + (80 X 2) + (2 X 9)

800 + 90 + 160 + 18

1098

500

98 X 21

2058

500

Estimate the product of 121 X 76 using rounding.

120 X 80 = 9,600