Adding fractions with like denominators
This Grade 4 worksheet practices adding fractions with like denominators (Common Core 4.MD.B.4, 4.NF.B.3a).
20 adding fractions with like denominators problems with an answer key. Free printable PDF.
20 problems · answer key on the last page · each version has different numbers · Print from the browser
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On this sheet
- 7/8 + 5/8 = ? — answer: 3/2
- 5/10 + 1/10 = ? — answer: 3/5
- 4/8 + 2/8 = ? — answer: 3/4
How to teach it
- Equivalent fractions: multiply or divide the numerator and the denominator by the same number.
- Comparing: with the same denominator, compare numerators; otherwise rewrite both over a common denominator.
- Adding and subtracting: the denominators must match first. Add or subtract the numerators and keep the denominator.
- Mixed numbers: add the wholes and the fractions, then regroup if the fraction part is one or more.
Questions teachers ask
- How many problems are on this worksheet?
- 20 on one page, with the answer key on the last page.
- What grade and standard is it for?
- Grade 4. Common Core: 4.MD.B.4, 4.NF.B.3a.
- Can I print more than one version?
- Yes. Every version has different numbers and its own answer key. Use “Make another version” for a new one; the same version always prints the same.
- When do students learn fractions?
- In the Common Core, fractions as numbers and on a number line start in Grade 3 (3.NF), adding and subtracting like denominators is Grade 4 (4.NF.B.3), and unlike denominators is Grade 5 (5.NF.A.1).
- Do the answers have to be in lowest terms?
- Each question says when it does. The answer key gives answers in lowest terms, and mixed numbers where the question asks for them.
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