Nearest 10
Nearest 100
Nearest 1,000
Estimate Addition
Estimate Subtraction
100

47

50

100

178

200

100

890

1,000

100

   347 + 221 =

  350 + 220 = 570

100

76 - 74

80 - 70 = 10

200

21

20

200

349

300

200

1,678

2,000

200

  76 + 32 =

  80 + 30 = 110

200

104 - 99

100 - 100 = 0

300

96

100

300

967

1,000

300

2,397

2,000

300

 87 + 57 = 

90 + 60 = 150

300

1,342 - 1,228 =

1,340 - 1,230 = 110

400

189

190

400

4,290

4,200

400

45,308

45,000

400

48 + 96

50 + 100 = 150

400

974 - 345 = 

970 - 350 = 620

500

472

470

500

5,896

5,900

500

9,874

10,000

500

237 + 301 = 

240 + 300 = 540

500

86 - 9 = 

90 - 10 = 80

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