Study Guide — 5.NF.A.2
Solve word problems involving addition and subtraction of fractions r…
Add and subtract fractions with like denominators and connect to unit fraction understanding.
What this standard means
- Solve word problems involving addition and subtraction of fractions referring to the same whole, including cases of unlike denominators, e.g., by using visual fraction models or equations to represent the problem. Use benchmark fractions and number sense of fractions to estimate mentally and assess the reasonableness of answers. For example, recognize an incorrect result 2/5 + 1/2 = 3/7, by observing that 3/7 < 1/2.
- Apply solve word problems involving addition and subtraction of fractions r… with models and explanation
- Adds/subtracts like-denominator fractions with models
_See printable PDF for diagram._
How to use the 20 practice sets
| Sets | When to use | | --- | --- | | 1–5 | Intro — explore together, short written items | | 6–10 | Core skills — diagrams and written practice | | 11–15 | Mixed review — explain thinking | | 16–20 | Stretch — word problems and mastery tasks |
Pacing: 10–15 minutes per session.
How to practice
1. Draw models before adding numerators 2. Keep denominators the same when adding parts 3. Simplify answers when appropriate
_See printable PDF for diagram._
Common mistakes
- Adding denominators
- Forgetting the whole context
Review and practice tests
1. Start Review 1/10 when sets 1–3 feel comfortable. 2. Move up one review level with little help. 3. Use Practice Test 4/10–6/10 for mid-standard checks. 4. Practice Test 10/10 is the mastery bar for 5.NF.A.2.
- [ ] Adds/subtracts like-denominator fractions with models
- [ ] Explains why denominators stay the same
- [ ] Solves simple fraction word problems
Materials for this standard
- Practice Problems — 20 printable sets
- Review — 10 difficulty levels
- Practice Test — 10 difficulty levels
- Answer key — for parents and tutors