Adding and subtracting decimals worksheets
Adding and subtracting decimals to hundredths by lining up the decimal points.
Download the free adding and subtracting decimals worksheet (PDF)
Adding and subtracting decimals worksheet
What’s on the worksheet
- 50 questions on adding and subtracting decimals, sized for US Letter paper
- 2 pages of questions plus an answer key on the last page
- Written for grade 5, matching Common Core 5.NBT.B.7
- Name and date lines at the top, and room to show the work
Sample questions from this worksheet
- 10.74 + 70.66 =
- 90.77 − 72.91 =
- 38.55 − 21.88 =
- 66.69 − 20.02 =
- 92.15 + 89.81 =
- 18.17 − 10.98 =
Preview the worksheet and answer key
Make a new adding and subtracting decimals worksheet
Need another page for extra practice, a retake or a second group in class? The free Mathify Kids test maker builds a fresh adding and subtracting decimals worksheet with different numbers every time. Choose Core, Standard or Challenge level, print it with its own answer key, or let your child take it on screen and see the score straight away.
Adding and subtracting decimals: a worked example (12.5 + 3.78)
12.50 + 3.78 ─────── 16.28
- Line up the decimal points. Write 12.5 as 12.50 so both have two decimal places.
- Add as usual from the right: 0 + 8 = 8, 5 + 7 = 12 (write 2, carry 1), 2 + 3 + 1 = 6, 1 + 0 = 1.
- Put the decimal point straight down: 16.28.
How to use it at home and in class
At home
Squared paper helps: one digit per box, with the decimal point on a line. Ten problems a day works better than a whole sheet at once. Mark them together with the answer key, then ask your child to explain one they got wrong: finding the mistake themselves is where the learning happens.
In class
Use the first row as a warm-up, a full page for independent practice, or five questions as an exit ticket. For a retake or a second group, make a new version with the test maker so every child gets different numbers.
Mistakes to watch for
- Lining up the last digits instead of the decimal points.
- Leaving the decimal point out of the answer.
What to practice before and after adding and subtracting decimals
- Before: rounding decimals. If this sheet is a struggle, go back a step.
- After: multiplying decimals, once this one is mostly right.
- Learn it first: the adding and subtracting decimals lesson and the decimals chart.
More decimals worksheets
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Questions parents ask
Why do you line up the decimal points?
So tenths add to tenths and hundredths add to hundredths. It is the same as lining up ones, tens and hundreds.
What grade is this adding and subtracting decimals worksheet for?
It is written for grade 5 and matches Common Core standard 5.NBT.B.7.
Can I get a different version of this adding and subtracting decimals worksheet?
Yes. Use the free Mathify Kids test maker to make a new adding and subtracting decimals worksheet with different numbers every time, at Core, Standard or Challenge level, with its own answer key.