1.What is the sum of 1/3 + 1/4 ?
A2/7
B7/12
C5/12
D2/12
Working
Grade 5fractionsOriginal practice
Adding & Subtracting Fractions with Unlike Denominators
5th grade fraction arithmetic practice. Find common denominators, convert equivalent fractions, and simplify sums to simplest form.
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About this practice
Grade 5 · math · Matching answer key included · US Letter and A4
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Teaching guide, sample answers and curriculum references
Before you begin
Recognize equal parts of one whole.
How to use this worksheet
- Model the target skill: add and subtract fractions with unlike denominators. Use the first task as a guided example before asking for an independent response.
- Check readiness first: Recognize equal parts of one whole.
- Discuss an incorrect response using this distinction: The denominator counts all equal parts. For addition, establish a common denominator rather than adding denominators.
A common mistake to discuss
The denominator counts all equal parts. For addition, establish a common denominator rather than adding denominators.
What to practice next
Draw an equivalent model or explain why the same-sized parts are needed.
Sample question and answer
What is the sum of 1/3 + 1/4 ?
- A. 2/7
- B. 7/12
- C. 5/12
- D. 2/12
Answer: B. Find common denominator 12: 1/3 = 4/12, and 1/4 = 3/12. Then add numerators: 4/12 + 3/12 = 7/12.
Intended curriculum references: CCSS.MATH.CONTENT.5.NF.A.1. These references describe learning goals; they are not endorsements.
Published 2026-10-02; updated 2026-10-02. Original MakeWorksheet practice. Automated consistency checks support publication; independent subject-specialist review is not recorded. Read our editorial policy.
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