Adding and Subtracting Fractions with Unlike Denominators

Name: _____________________________
Date: _____________________________

Instructions: Find a common denominator, then add or subtract the fractions. Simplify your answers where possible. Show your working.

Section A: Addition

1. 1/3 + 1/4 = ________________

2. 2/5 + 1/3 = ________________

3. 3/8 + 1/2 = ________________

4. 2/3 + 3/5 = ________________

5. 5/6 + 1/4 = ________________

6. 3/10 + 2/5 = ________________

Section B: Subtraction

7. 5/6 − 1/3 = ________________

8. 3/4 − 2/5 = ________________

9. 7/8 − 1/2 = ________________

10. 4/5 − 1/4 = ________________

11. 5/6 − 3/8 = ________________

12. 7/10 − 1/5 = ________________

Section C: Word Problems

13. Sarah spent 2/5 of her pocket money on books and 1/4 on snacks. What fraction of her pocket money did she spend altogether?

Answer: ________________

14. A recipe calls for 3/4 cup of flour. James has already added 1/3 cup. How much more flour does he need to add?

Answer: ________________

15. A water tank was 5/6 full. After watering the garden, it was 2/3 full. What fraction of the tank was used for watering?

Answer: ________________