8th Grade Adding and Subtracting Fractions Worksheet — Level 3 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 8th Grade fractions worksheet.
Success TutoringWorksheetsAnswer sheet8th Grade · Mathematics · Fractions8th Grade Adding and Subtracting Fractions Worksheet — Level 3 — Practice Set 2 — Answers
Find a common denominator first. Give answers in simplest form.
1. +
Answer:
- Lowest common denominator is 42: = , =
- + =
2. −
Answer:
- Lowest common denominator is 72: = , =
- − =
- Simplify: =
3. +
Answer:
- Lowest common denominator is 18: = , =
- + =
- Simplify: =
4. −
Answer:
- Lowest common denominator is 21: = , =
- − =
5. +
Answer:
- Lowest common denominator is 72: = , =
- + =
- Simplify: =
6. +
Answer: 1 (or )
- Lowest common denominator is 24: = , =
- + =
- Simplify: =
- As a mixed number: 1
7. +
Answer: 1 (or )
- Lowest common denominator is 12: = , =
- + =
- As a mixed number: 1
8. −
Answer:
- Lowest common denominator is 35: = , =
- − =
9. +
Answer:
- Lowest common denominator is 12: = , =
- + =
- Simplify: =
10. −
Answer:
- Lowest common denominator is 15: = , =
- − =
11. −
Answer:
- Lowest common denominator is 12: = , =
- − =
12. −
Answer:
- Lowest common denominator is 72: = , =
- − =
- Simplify: =
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.