Add using compatible numbers
Round to the nearest 10
Round to the nearest 100
Round to the nearest 1000
Round to the nearest compatible number
100

6+3=

10+0=10

100

11

10

100

103

100

100

3010

3000

100

203

200

200

26+73=

25+75=100

200

27

30

200

3

0

200

4567

5000

200

345

350

300

132+480=

125+475=600

300

36

40

300

356

400

300

3500

4000

300

180

175

400

987+123=

1000+125=1125

400

129

130

400

1234

1200

400

19365

19000

400

470

475

500

1578+323=

1575+325=1900

500

234

230

500

123+132=

120+130=250

500

17689

18000

500

169

175

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