Powers of 10
Rounding
Standard algorithm
Area model
Adding and subtracting
100

24 x 10

240

100

Round 445.78 to the nearest tenth

445.8

100

88 x 3

264

100

3 x 0.3

0.9

100

67.98 + 15.77

83.75

200

675 ÷ 10

67.5

200
Round 19 to the nearest ten

20

200

714 x 5

3,570

200

6 x 2.6

15.6

200

0.984 + 1.23

2.214

300

.3421 x 103

342.1

300

Round 900.873 to the nearest hundredth

900.87

300

34 x 12

408

300

3.1 x 4.3

13.33

300

74.93 - 12.04

62.89

400

12.988÷ 102

.12988

400

Round 0.4682 to the nearest whole

0

400

57 x 35

1,995

400

7.2 x 3

21.6

400

.67 + 2.7

3.37

500

58,799 ÷ 1,000

58.799

500

Round 12.5637 to the nearest thousandth

12.564

500

211 x 23

4,853

500

24.6 x 4.2

103.32

500

0.974 - 0.35

0.624

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