To review these concepts, go to Adding and Subtracting Decimals Study Guide.
Adding and Subtracting Decimals Practice Questions
Practice
Where should the decimal point be placed in each sum?
 3.5 + 3.7 = 72
 1.4 + 0.8 = 22
 1.79 + 0.21 = 200
 4.13 + 2.07 + 5.91 = 1211
 4.835 + 1.217 = 6052
 9.32 + 4.1 = 1342
 7.42 + 125.931 = 133351
 6.1 + 0.28 + 4 = 1038
Add the following decimals.
 1.789 + 0.219
 1.48 + 0.9
 3.59 + 6
 10.7 + 8.935
 6.1 + 0.2908 + 4
 14.004 + 0.9 + 0.21
 1.03 + 2.5 + 40.016
 5.2 + 0.7999 + 0.0001
Subtract the following decimals.
 6.4 – 1.3
 1.89 – 0.37
 12.35 – 8.05
 2.35 – 0.9
 5 – 3.81
 3.2 – 1.23
 1 – 0.98765
 2.4 – 2.3999
Add and subtract the following decimals.
 6.4 – 1.3 + 1.2
 8.7 – 3.2 + 4
 5.48 + 0.448 – 0.24
 7 – 0.3 – 3.1 + 3.8
 4.7 + 2.41 – 0.8 – 1.77
 1 – 0.483 + 3.17
 14 – 0.15 + 0.8 – 0.2
 22.2 – 3.3 – 4.4 – 5.5
Word Problems Practice
Word problems 33–40 involve decimal addition, subtraction, and rounding.

At the supermarket, Alberto purchased 2.3 pounds of tomatoes, 1.1 pounds of lettuce, a 0.6 pound cucumber, and 4 pounds of carrots. He also decided to buy 1.2 pounds of bananas. How many pounds of produce did Alberto buy?
a. 5.2
b. 8.1
c. 9.2
d. 10.4
e. 12.8

Janice improved her time running a mile in track from 6.3 minutes to 5.66 minutes. By how much time did she improve?
a. 0.36 minute
b. 0.64 minute
c. 0.76 minute
d. 1.23 minutes
e. 1.36 minutes

John loaned Alexis $70.28 on Friday, and on Saturday, Alexis thanked him by paying him back $75. How much extra money did Alexis give to John?
a. $5.28
b. $4.72
c. $4.28
d. $4.72
e. $4.82

Joseph had a credit card balance of $278.24 at the beginning of the month. He bought some clothes for $135.30 and a television for $221.28. At the end of the month, he made a payment of $350. How much money is needed to pay off his debt completely?
a. $273.82
b. $283.82
c. $284.82
d. $634.82
e. $984.82

Karin bought three books for $8.95 each and two magazines for $1.49 each. How much did she spend in total?
a. $29.83
b. $26.83
c. $29.94
d. $27.83
e. $28.94
 Matt bought some used records and CDs that cost $6.99, $12.49, $8.50, and $11.89. The cashier told him the total was $39.87.Was this reasonable? Why or why not?
 John walked 1.4 miles to work, 0.7 miles to lunch, and 0.8 miles to the store. Cindy ran 3.6 miles for exercise at the local track. Who covered more distance? By how much?
 Brand A's road bike weighs 22.5 pounds, and brand B's bike weighs 22.15 pounds. Which one is lighter? By how much?
Add Decimals and Fractions Practice
Solutions
 7.2
 2.2
 2.0
 12.11
 6.052
 13.42
 133.351
 10.38
 2.008
 2.38
 9.59
 19.635
 10.3908
 15.114
 43.546
 6
 5.1
 1.52
 4.3
 1.45
 1.19
 1.97
 0.01235
 0.0001
 6.3
 9.5
 5.688
 7.4
 4.54
 3.687
 14.45
 9 or 9.0
 c.
 b.
 d.
 c.
 a.
 Yes. Round the prices to nearest dollar and add them: $7 + $12 + $9 + $12 = $40.
 Cindy, by 0.7 miles. John's distance was 1.4 + 0.7 + 0.8 = 2.9 miles. The extra distance that Cindy covered is 3.6  2.9 = 0.7 miles.
 Brand B by 0.35 pounds.
 1
 0.5 or
 1.125 or
 5.2
 2.75 or
 1
 5.9 or
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