Rounding Decimals
Estimating Sums
& Differences
Adding and Subtracting Decimals
100
Round the decimal to the given place-value. 5.031; hundredths
What is 5.03
100
Estimate using rounding. 38.23 + 11.84
What is 38 + 12 = 51
100
Add the decimals 43.28 + 31.45
What is 74.73
200

Round the decimal to the given place-value. 0.0427; thousandths

What is 0.043

200
Estimate using Rounding. 75.38 + 22.04
What is 75. + 22 = 97
200
Add the decimals 0.724 + 6.458
What is 7.182
300

Round the decimal to the given place-value. 27.35; tens

What is 27

300

Estimate using Rounding: 31.29 + 58.07

What is 30 + 60 = 90

300
Add the Decimals 1.325 + 0.081
What is 1.406
400

Round the decimal to the given place-value. 3.4553; thousandths

What is 3.455

400

Estimate using clustering 12.045 + 11.81 + 12.3 + 11.56

What is 12. + 12. + 12. + 12. = 48

400
Subtract the decimals 148.93 - 121.36
What is 27.57
500
Round the decimal to the given place-value. 2.059; hundredths
What is 2.06
500

Estimate using clustering. 6.45 + 5.88 + 5.61 + 6.03

What is 6 + 6 + 6 + 6 = 24

500
Subtract the decimals 248 - 131.48
What is 116.72
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