Round the dividend
Round the divisor
Round both numbers
Estimate & compare
100

Round 8.2 ÷ 42 to estimate the answer. 

8 ÷ 42 = 0.2

100

Estimate 14.9 ÷ 32 by rounding only the divisor

14.9 ÷ 30 = 0.5

100

Round 12.4 ÷ 29 and estimate

12 ÷ 30 = 0.4

100

Which is larger? 3.5 ÷ 18 or 7.2 ÷ 25

Estimate 3.5 ÷ 20 = 0.2 and 7.2 ÷ 25 = 0.3, so 7.2 ÷ 25 is larger.

200

Round 15.2 ÷ 30 and estimate. 

15 ÷ 30 = 0.5

200

Estimate 61.8 ÷ 48 by rounding only the divisor.

61.8 ÷ 50 = 1.2

200

Round 48.2 ÷ 73 to estimate

50 ÷ 70 = 0.7

200

Which is larger? 6.4 ÷ 20 or 5.1 ÷ 15

Estimate 6.4 ÷ 20 = 0.3 and 5.1 ÷ 15 = 0.3, so they’re approximately equal.

300

Round 34.7 ÷ 50 to estimate

35 ÷ 50 = 0.7

300

Estimate 25.4 ÷ 41 by rounding only the divisor.

25.4 ÷ 40 = 0.6

300

Round 19.9 ÷ 51 and estimate

20 ÷ 50 = 0.4

300

Which is larger? 45.5 ÷ 22 or 56.3 ÷ 28

Estimate 45.5 ÷ 20 = 2.3 and 56.3 ÷ 30 = 1.9, so 45.5 ÷ 22 is larger.

400

Round 71.6 ÷ 85 and find the estimated quotient

72 ÷ 85 = 0.8

400

Estimate 83.6 ÷ 21 by rounding only the divisor.

83.6 ÷ 20 = 4.2

400

Round 76.4 ÷ 26 and estimate

75 ÷ 25 = 3

400

Which is larger? 99.2 ÷ 33 or 74.1 ÷ 28

Estimate 99.2 ÷ 30 = 3.3 and 74.1 ÷ 30 = 2.57, so 99.2 ÷ 33 is larger.

500

Round 121.9 ÷ 24 to the nearest whole number and estimate

122 ÷ 24 = 5

500

Estimate 107.5 ÷ 66 by rounding only the divisor

107.5 ÷ 70 = 1.5

500

Round 135.7 ÷ 44 to the nearest ten and estimate

140 ÷ 40 = 3.5

500

Which is larger? 142.7 ÷ 15 or 124.9 ÷ 20

Estimate 142.7 ÷ 15 = 9.5 and 124.9 ÷ 20 = 6.2, so 142.7 ÷ 15 is larger.

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