Adding & Subtracting Decimals

Estimating Sums& Differences

100

Estimate using rounding. 38.23 + 11.84

What is 38 + 12 = 51

200

Estimate using Rounding. 75.38 + 22.04

What is 75 + 22 = 97

300

Estimate using Front-End Estimation 31.29 + 58.07

What is 31+ 58 = 89

400

Estimate using clustering 12.045 + 11.81 + 12.3 + 11.56

What is 12 + 12 + 12 + 12 = 48

500

Estimate using clustering. 6.45 + 5.88 + 5.61 + 6.03

What is 6 + 6 + 6 + 6 = 24

Adding and Subtracting Decimals

100

Add the decimals 43.28 + 31.45

What is 74.73

200

Add the decimals 0.724 + 6.458

What is 7.182

300

Add the Decimals 1.325 + 0.081

What is 1.406

400

Subtract the decimals 148.93 - 121.36

What is 27.57

500

Subtract the decimals 248 - 131.48

What is 116.72