1 2/3 + 3 2/3 = 4 4/3 = 5 1/3
4 3/5 + 2 1/5 = 6 4/5
4 4/7 + 2 5/7 = 6 9/7 = 7 2/7
3 7/12 + 4 10/12 = 7 17/12 = 8 5/12
12/17 + 3 14/17= 3 26/17 = 4 9/17
3 13/16 -1 7/16= 2 12/16 = 2 3/4
5 7/8 - 2 5/8 = 3 2/8 = 3 1/4
19 15/17 - 15 6/17 = 4 9/17
16 12/13 - 11 5/13 = 5 7/13
