1/2 + 1/3 = 3/6 + 2/6 = 5/6

2/3 + 1/4 = 8/12 + 3/12 = 11/12

5/7 - 1/6 = 30/42 - 7/42 = 23/42

1/8 + 1/4 = 4/32 + 8/32 = 12/32 = 3/8

1/2 - 5/12 = 6/12 - 5/12 = 1/12

1/8 + 7/12 = 3/24 + 14/24 = 17/24

5/9 + 3/4 = 20/36 + 27/36 = 47/36 (which is equal to 1 and 11/36)

9/35 - 3/28 = 216/980 - 105/980 = 111/980