Adding fractions with like denominators worksheets
Adding and subtracting fractions that already have the same denominator. Only the top numbers change.
Download the free adding and subtracting fractions with like denominators worksheet (PDF)
Adding and subtracting fractions with like denominators worksheet
What’s on the worksheet
- 50 questions on adding and subtracting fractions with like denominators, sized for US Letter paper
- 3 pages of questions plus an answer key on the last page
- Written for grade 4, matching Common Core 4.NF.B.3
- Name and date lines at the top, and room to show the work
Preview the worksheet and answer key
Make a new adding and subtracting fractions with like denominators 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 fractions with like denominators 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 fractions with like denominators: a worked example (3/8 + 4/8 and 5/6 − 1/6)
- 3/8 + 4/8: add the tops, 3 + 4 = 7. The answer is 7/8.
- 5/6 − 1/6: subtract the tops, 5 − 1 = 4, giving 4/6.
- Simplify: 4/6 = 2/3.
How to use it at home and in class
At home
Say the fractions as words: “3 eighths plus 4 eighths is 7 eighths.” The denominator is the name, and names don’t add. 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
- Adding the denominators too, so 3/8 + 4/8 becomes 7/16.
- Forgetting to simplify the answer.
What to practice before and after adding and subtracting fractions with like denominators
- Before: comparing fractions. If this sheet is a struggle, go back a step.
- After: adding and subtracting fractions with unlike denominators, once this one is mostly right.
- Learn it first: the adding and subtracting fractions with like denominators lesson and the fractions chart.
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Questions parents ask
Why don’t you add the denominators?
The denominator tells you the size of the pieces. Adding 3 eighths and 4 eighths gives 7 pieces that are still eighths.
What grade is this adding and subtracting fractions with like denominators worksheet for?
It is written for grade 4 and matches Common Core standard 4.NF.B.3.
Can I get a different version of this adding and subtracting fractions with like denominators worksheet?
Yes. Use the free Mathify Kids test maker to make a new adding and subtracting fractions with like denominators worksheet with different numbers every time, at Core, Standard or Challenge level, with its own answer key.