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Rounding to the Nearest 10
Rounding to the Nearest 100
Round and Add
Round and Subtract
Add or Subtract
100

27

30

100

234

200

100

What is the estimated equation and answer? 

27 + 18

30 + 20 = 50

100

What is the estimated equation and answer?

69 - 44 =

70 - 40 = 30

100

23 + 32 =

55

200

44

40

200

736

700

200

What is the estimated equation and answer?

47 + 33 =

50 + 30 = 80

200

What is the estimated equation and answer?

82 - 14 = 

80 - 10 = 70

200

59 - 33 =

26

300

98

100

300

551

600

300

What is the estimated equation and answer?

278 + 388 =

280 + 390 = 670

or

300 + 400 = 700

300

What is the estimated equation and answer?

423 - 123 = 

420 - 120 = 300

or

400 - 100 = 300

300

378 + 251 = 

629

400

123

120

400

1,464

1,500

400

What is the estimated equation and answer?

378 + 475 =

380 + 480 = 860

or

400 + 500 = 900

400

What is the estimated equation and answer?

782 - 431 = 

780 - 430 = 350

or 

800 - 400 = 400

400

371 - 158 =

213

500

155

160

500
2,633

2,600

500

What is the estimated equation and answer?

1,223 + 1,859 =

(Round to the nearest hundred)

1,200 + 1,900 = 3,100

500

What is the estimated equation and answer?

7,822 - 1,689 = 

(Round to the nearest hundred!)

7,800 - 1,700 = 6,100

500

534 - 329 = 

205