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. 0.00042; ten-thousandths
What is 0.0004
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 Front-End Estimation 31.29 + 58.07
What is 31. + 58 = 89
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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