Rounding and Estimating

Rounding

100

Round 32 to the nearest ten

30

200

Round 385 to the nearest hundred

400

300

Round 492 to the nearest ten

500

400

Round 294 to the nearest hundred

300

500

Round 464 to the nearest hundred 

500

Round to Underlined Digit

100

137

100

200

55,492

55,500

300

835,837

835,840

400

152

200

500

449

450

Estimate Sum

100

Estimate the sum by rounding to the nearest hundred: 452 + 312

500 + 300 = About 800

200

Estimate the sum by rounding to the nearest hundred:

425 + 268

400 + 300 = About 700

300

Estimate the sum by rounding to the nearest hundred:

799 + 152

800 + 200 = 1,000

400

Estimate the sum by rounding to the nearest ten

786 + 12

790 + 10 = 800

500

Estimate the sum by rounding to the nearest ten

7 + 99 = 

10 + 100 = 110

Estimate Difference

100

Estimate the difference by rounding to the nearest ten:

57 - 42

60 - 40 = About 20

200

Estimate the difference by rounding to the nearest ten:

657 - 442

660 - 440 = About 220

300

Estimate the difference by rounding to the nearest hundred

573 - 222

600-200= 400

400

Estimate the difference by rounding to the nearest hundred:

729 - 626

700- 600= 100

500

Estimate the difference by rounding to the nearest ten:

572 - 299

570-300= 270

Adding/subtracting 3 digit numbers

100

310 + 296

606

200

659+731

1,390

300

562 + 973

1,535

400

466-259

207

500

349-247

102