Round to the Nearest Ten
Round Nearest Hundred
Estimate the Sum
Adding 3-digit Numbers
100

23

20

100

890

900

100

43+26=

40+30=70

100

234+100

334

200

57

60

200

147

100

200

90+37=

90+40=130

200

327+256=

583

300

476

480

300

555

600

300

172+109=

170+110=280

300

405+466

871

400

923

920

400

451

500

400

205+406=

200+400=600

400

708+217

925

500

178

180

500

303

300

500

769+445=

800+400=1,200

500

568+389

957

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