5th Grade Adding Fractions with Unlike Denominators Worksheet
Add fractions with different denominators by rewriting them over a common denominator first.
- Homework
- Review
- Test Prep
- Tutoring
Download the Free Printable PDF
No sign-up required. Clean, low-ink US Letter format.
- Grade
- 5th Grade
- Subject
- Math
- Skill
- Fractions
- Topic
- adding fractions with unlike denominators
- Difficulty
- Standard
- Time
- 18 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 unlike denominators by rewriting them with a common denominator.
- Finding a common denominator
- Rewriting fractions as equivalent fractions
- Adding once the denominators match
Inside This Printable
Student directions: Add. Rewrite the fractions with a common denominator first, then add the numerators.
Worked example
1/2 + 1/4: rewrite 1/2 as 2/4, then 2/4 + 1/4 = 3/4.
Sample questions
- 1/2 + 1/4 =
- 1/3 + 1/6 =
- 1/2 + 1/3 =
The PDF contains 8 practice questions plus 2 challenge questions.
Worksheet Preview
You can only add equal-size pieces
Adding 1/2 + 1/4 directly is like adding apples and oranges — the pieces are different sizes. The fix is to rename both fractions with a common denominator so every piece is the same size, then add the numerators. Here 1/2 becomes 2/4, and 2/4 + 1/4 = 3/4.
How to use it
Lean hard on equivalent fractions (the grade-4 skill): find a common denominator, rewrite each fraction, then add. The most common error is adding straight across (1/2 + 1/4 = 2/6). Remind students the denominator names the size of the piece — it doesn’t get added. This leads into multiplying fractions.
👩🏫 Teacher note
Anchor on equivalent fractions: you can only add pieces of the same size, so rename both fractions to a common denominator before adding.
🏠 Parent note
You can't add halves and fourths until they're the same size. Rewrite 1/2 as 2/4, then add.
Common Mistakes to Watch For
- Adding numerators and denominators straight across
- Using a common denominator but forgetting to convert the numerators
Answer Key
Each answer shows the sum; simplify where noted.
⬇ 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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Mixed Numbers and Improper Fractions Worksheet
Convert improper fractions to mixed numbers and back, keeping the denominator the same.
Multiplying Fractions Worksheet
Multiply fractions by multiplying the numerators and the denominators, then simplifying when you can.
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