Adding fractions worksheets
Twelve like-denominator additions — add the tops, keep the bottom, write the answer as a fraction.
Best fit: 4th grade · Answer key included · Free, no sign-up
Answer key
The same sheet with every answer shown in blue — print it for marking, or hand it over for self-checking.
About these worksheets
Adding fractions starts with like denominators, where the rule is honest and visible: three eighths plus two eighths is five eighths — add the counts, the part size doesn’t change. Every sum on this sheet stays a proper fraction, keeping the focus on the principle. The critical error to catch early: adding the denominators too (3/8 + 2/8 is NOT 5/16). Unlike denominators come later, powered by the equivalent-fractions skill.
Grade level: this sheet is part of our5th grade math worksheets collection.
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Frequently asked questions
Why don’t you add the denominators?
The denominator names the part size; the numerator counts parts. Adding 3 eighths and 2 eighths gives 5 eighths — the size of the parts never changed.
Do any answers go over one whole?
No — every sum here is a proper fraction, so attention stays on the add-the-numerators principle.
What comes after like denominators?
Unlike denominators, using equivalent fractions to make them match — practise that skill on the equivalent fractions worksheet first.