Adding and Subtracting Decimals Worksheet

Question 1

Find the sum: 3.4 + 2.5

Accepted Answer

The sum is 5.9. Line up the decimal points and add the tenths and ones.

Question 2

Find the difference: 7.8 - 4.2

Accepted Answer

The difference is 3.6. Subtract the tenths and ones after lining up the decimal points.

Question 3

Find the sum: 6.25 + 1.34

Accepted Answer

The sum is 7.59. Add the hundredths, tenths, and ones in order after lining up the decimal points.

Question 4

Find the difference: 9.50 - 2.17

Accepted Answer

The difference is 7.33. Subtract carefully from right to left, using regrouping if needed.

Question 5

A notebook costs $4.75 and a pen costs $1.20. How much do they cost altogether?

Accepted Answer

They cost $5.95 altogether. Add 4.75 and 1.20 to find the total cost.

Question 6

You have $10.00 and spend $3.45 on a snack. How much money do you have left?

Accepted Answer

You have $6.55 left. Subtract 3.45 from 10.00 to find the remaining amount.

Question 7

Find the sum: 0.6 + 0.27

Accepted Answer

The sum is 0.87. Write 0.6 as 0.60 so the place values line up correctly.

Question 8

Find the difference: 5.00 - 0.86

Accepted Answer

The difference is 4.14. Regroup as needed when subtracting the hundredths and tenths.

Question 9

A rope is 8.4 meters long. You cut off 2.35 meters. How much rope is left?

Accepted Answer

There are 6.05 meters of rope left. Subtract 2.35 from 8.40 after lining up the decimal points.

Question 10

Find the sum: 12.08 + 3.7

Accepted Answer

The sum is 15.78. Write 3.7 as 3.70 so the decimal places line up.

Question 11

Find the difference: 14.2 - 6.95

Accepted Answer

The difference is 7.25. Rewrite 14.2 as 14.20 and subtract carefully.

Question 12

Mia ran 1.75 miles on Monday and 2.5 miles on Tuesday. How many miles did she run in all?

Accepted Answer

Mia ran 4.25 miles in all. Add 1.75 and 2.50 to find the total distance.

Question 13

A bottle holds 3.00 liters of water. If 1.48 liters are poured out, how much water remains?

Accepted Answer

There are 1.52 liters remaining. Subtract 1.48 from 3.00 to find the amount left.

Question 14

Find the sum: 0.99 + 4.06

Accepted Answer

The sum is 5.05. Add the hundredths, tenths, and ones after lining up the decimal points.

Question 15

Find the difference: 20.00 - 7.89

Accepted Answer

The difference is 12.11. Subtract 7.89 from 20.00 carefully, using regrouping across place values.

Adding and Subtracting Decimals