1) 3/4 + 5/8 = 11/8 = 1 3/8
2) 2/5 + 7/15 = 6/15 + 7/15 = 13/15
3) 7/16 + 1/4 = 7/16 + 4/16 = 11/16
4) 2/7 + 1/3 = 6/21 + 7/21 = 13/21
5) 5/18 + 2/3 = 5/18 + 12/18 = 17/18
6) 5/6 + 7/8 = 20/24 + 21/24 = 41/24 = 1 17/24
7) 5/6 + 2/9 = 15/18 + 4/18 = 19/18 = 1 1/18
8) 5/18 + 2/3 = 5/18 + 12/18 = 17/18