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Rounding to the Nearest 10
Rounding to the Nearest 100
Addition
Subtraction
Estimating
100

Round 53 to the nearest ten.

50

100

Round 782 to the nearest hundred.

800

100

611 + 125

736

100

128 - 23

105

100

Estimate 135 + 287 by rounding to the nearest HUNDRED.

100+300=400

200

Round 144 to the nearest ten.

140

200

Round 522 to the nearest hundred.

500

200

821 + 118

939

200

649 - 133

516

200

Estimate 141 + 68 by rounding to the nearest TEN.

140+70=210

300

Round 128 to the nearest ten.

130

300

Round 1,293 to the nearest hundred.

1,300

300

670 + 252

922

300

913 - 261

652

300

Estimate 895 - 312 by rounding to the nearest HUNDRED.

900-300=600

400

Round 649 to the nearest ten.

650

400

Round 6,780 to the nearest hundred.

6,800

400

648 + 169

817

400

885 - 139

746

400

Estimate 967 - 132 by rounding to the nearest TEN.

960-130=830

500

Round 345 to the nearest ten.

350

500

Round 4,555 to the nearest hundred.

4,600

500

1,296 + 3,273

4,569

500

208 - 119

89

500

Which TWO estimates are appropriate for the following problem?

139 + 712

a. 140 + 710 = 850

b. 200 + 700 = 900

c. 149 + 722 = 871

d. 100 + 700 = 800


a. (850) and d. (800)