Rounding and Estimating

Round to the Nearest Hundred

100

Round 325 to the nearest hundred

300

200

Round 385 to the nearest hundred

400

300

Round 492 to the nearest hundred

500

400

Round 650 to the nearest hundred

700

500

Round 2,550 to the nearest hundred 

2,600

Round to The Nearest Ten

100

137

140

200

492

490

300

837

840

400

977

980

500

432

7,430

Estimate Sum

100

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

450 + 310 = About 760

200

Estimate the sum by rounding to the nearest ten:

426 + 268

430 + 270 = About 700

300

Estimate the sum by rounding to the nearest hundred:

799 + 158

800 + 200 = About 1,000

400

Estimate the sum by rounding to the nearest ten:

786 + 242

790+240= 1,030

500

Estimate the sum by rounding to the nearest hundred: 

468 + 393

500+400=900

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:

572 - 299

600 - 300 = About 300

400

Estimate the difference by rounding to the nearest hundred:

544 - 165

500 - 200 = About 300

500

Estimate the difference by rounding to the nearest ten:

74-21

70 - 20 = About 30