Rounding
Estimating Sums
Estimating
Differences
Finding Sums
Finding Differences
100

Round 345 to the nearest ten.

350

100

413 + 356 estimated to the nearest hundred

800

100

587 - 347 estimated to the nearest ten

240

100

345 + 276 =

621

100

883 - 388 =

495

200

Round 678 to the nearest hundred.

700

200

523 + 413 estimated to the nearest ten

930

200

What is 146 - 118 estimated to the nearest hundred

0

200

542 + 109 =

651

200

246 - 127 =

119

300

Round 429 to the nearest hundred.

400

300

535 + 234 estimated to the nearest ten

770

300

615 - 523 estimated to the nearest ten

100

300

283 + 147 =

430

300

919 - 284 =

635

400

Round 513 to the nearest ten.

510

400

349 + 107 estimated to the nearest ten

460

400

682 - 224 estimated to the nearest ten

460

400

127 + 39 + 87 =

253

400

500 - 245 =

255

500

Round 936 to the nearest ten.

940

500

291 + 268 estimated to the nearest hundred

600

500

588 - 332 estimated to the nearest hundred

300

500

46 + 461 + 309 =

816

500

800 - 427 =

373