1) 5/9 + 13/27 = 15/27 + 13/27 = 28/27 = 1 1/27

2) 3/8 + 5/24 = 9/24 + 5/24 = 13/24

3) 5/12 - 13/72 = 30/72 - 13/72 = 17/72

4) 3/5 - 1/7 = 21/35 - 5/35 = 16/35

5) 5/12 + 1/60 = 25/60 + 1/60 = 26/60 = 13/30

6) 9/17 - 19/68 = 36/68 - 19/68 = 17/68 = 1/4

7) 9/10 + 4/15 = 27/30 + 8/30 = 35/30 = 7/6 = 1 1/6

8) 4/15 - 11/60 = 16/60 - 11/60 = 5/60 = 1/12