Answer:
Step-by-step explanation:
1. 7 4/11 + 2 6/11 = 9 10/11
2. 5 1/12 + 6 3/12 = 11 4/12 = 11 1/3
3. 8 4/15 + 3 2/15 = 11 6/15 = 11 2/5
4. 6 1/9 + 2 3/9 = 6 4/9
