4th Grade Adding Fractions with Like Denominators Worksheet
Add fractions that share a denominator by adding the top numbers and keeping the bottom number the same.
- Homework
- Review
- Test Prep
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No sign-up required. Clean, low-ink US Letter format.
- Grade
- 4th Grade
- Subject
- Math
- Skill
- Fractions
- Topic
- adding fractions with like denominators
- Difficulty
- Standard
- Time
- 15 minutes
- Pages
- 2 (incl. answer key)
- Format
- Printable PDF (US Letter)
- Answer key
- Included
- Best for
- homework, review, test prep, tutoring
Worksheet details
What This Worksheet Practices
Students will add fractions with like denominators by adding the numerators and keeping the denominator.
- Adding numerators over a common denominator
- Keeping the denominator unchanged
- Recognizing sums equal to or greater than one whole
Inside This Printable
Student directions: Add the fractions. Add the top numbers and keep the bottom number the same.
Worked example
1/4 + 2/4: add the tops (1 + 2 = 3), keep the bottom -> 3/4.
Sample questions
- 1/4 + 2/4 =
- 2/5 + 1/5 =
- 3/8 + 2/8 =
The PDF contains 8 practice questions plus 2 challenge questions.
Worksheet Preview
Add the pieces, not the names
The whole trick of adding fractions with the same denominator: the denominator names the size of the piece, and that size doesn’t change. Two fifths plus one fifth is three fifths — you’re just counting more pieces of the same size. The classic error is adding the bottoms too (2/5 + 1/5 = 3/10), which would magically shrink the pieces.
How to use it
Say each problem in words — “two fifths plus one fifth” — so students hear that only the count of pieces changes. Point out sums like 2/3 + 1/3 that make one whole (3/3). This builds on naming fractions of a shape and pairs with equivalent and comparing fractions.
👩🏫 Teacher note
Anchor it in meaning: 2 fourths plus 1 fourth is 3 fourths — the size of the piece (the denominator) never changes, you just count more of them.
🏠 Parent note
Add only the top numbers. The bottom number stays the same, because the size of each piece doesn't change.
Common Mistakes to Watch For
- Adding the denominators as well as the numerators
- Forgetting that the denominator names the size of the piece and stays the same
Answer Key
Each answer shows the sum; some equal one whole or more.
⬇ Download Answer Key (PDF)Learn this skill first
Take the free lesson on fractions — worked examples and practice exercises, then come back to this worksheet.
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