Adding & Subtracting Fractions — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 38 + 48 = 78.
3 + 4 = 7, denominator stays 8. Answer: 78.
2. 1112 − 712 = 412.
11 − 7 = 4, denominator stays 12. Answer: 412.
3. 25 + 25 = 45.
2 + 2 = 4, denominator stays 5. Answer: 45.
4. 910 − 610 = 310.
9 − 6 = 3, denominator stays 10. Answer: 310.
5. 13 + 13 = 23.
1 + 1 = 2, denominator stays 3. Answer: 23.
6. 56 − 16 = 46.
5 − 1 = 4, denominator stays 6. Answer: 46.
7. 49 + 39 = 79.
4 + 3 = 7, denominator stays 9. Answer: 79.
8. 78 − 58 = 28.
7 − 5 = 2, denominator stays 8. Answer: 28.
9. 610 + 310 = 910.
6 + 3 = 9, denominator stays 10. Answer: 910.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
57 + 17
→ 67
44
89 − 39
→ 59
612
34 + 14
→ 44
59
1012 − 412
→ 612
67
57+17=67; 89−39=59; 34+14=44; 1012−412=612.