Rounding and Estimating Sums (Allen)

Round: Nearest Ten

100

Round 32 to the nearest ten

30

200

Round 85 to the nearest ten

90

300

Round 147 to the nearest ten

150

400

Round 99 to the nearest ten

100

500

Round 464 to the nearest ten

460

Round: Nearest Hundred

100

Round 137 to the nearest hundred

100

200

Round 567 to the nearest hundred

600

300

Round 890 to the nearest hundred

900

400

Round 1,522 to the nearest hundred

1,500

500

Round 1,997 to the nearest hundred

2,000

Estimate with addition (to nearest hundred)

100

Estimate 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:

679 + 215

700 + 200 = About 900

400

Estimate the sum by rounding to the nearest hundred:

786 + 242

800 + 200 = About 1,000

500

Estimate the sum by rounding to the nearest hundred: 

477 + 617

500 + 600 = about 1,100

Estimate with addition (to nearest ten)

100

Estimate the sum by rounding to the nearest ten:

47 + 52

50 + 50 = about 100

200

Estimate the sum by rounding to the nearest ten:

12 + 83

10 + 80 = About 90

300

Estimate the sum by rounding to the nearest ten:

89 + 9

90 + 10 = About 100

400

Estimate the sum by rounding to the nearest ten:

404 + 82

400 + 80 = About 480

500

Estimate the sum by rounding to the nearest ten:

903 + 99

900 + 100 = About 1,000