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Adding
subtracting
Word Problems
Estimating Sums
& Differences
Adding and Subtracting Decimals
100

What is 12.4 + 5.68?

18.08

100

What is 8.9 – 3.25?

5.65

100

Lena bought a book for $12.95 and a notebook for $4.75. How much did she spend?

$17.70

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

What is 23.95 + 14.07?

38.02

200

What is 24.5 – 9.78?

14.72

200

Sam ran 4.38 miles on Monday and 6.75 miles on Tuesday. How many miles did he run in total?

11.13 miles

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

What is 102.56 + 3.9?

106.46

300

What is 76.8 – 42.35?

34.45

300

A tank had 120.8 liters of water. After draining 45.3 liters, how much water is left?

75.5 liters

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

What is 245.3 + 78.65?

323.95

400

What is 120.6 – 56.47?

64.13

400

Emma’s suitcase weighed 29.5 kg. Her friend’s suitcase weighed 33.2 kg. How much heavier was her friend’s suitcase?

3.7 kg

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

What is 17.84 + 9.756?

27.596

500

What is 345.92 – 88.59?

257.33

500

A rope is 125.9 meters long. If 48.75 meters are cut off, how much rope remains?

77.15 meters

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