1) 3 4/5 - 2 3/5 = 1 1/5.
2) 7 5/6 - 4 2/3 = 7 5/6 - 4 4/6 = 3 1/6.
3) 4 5/6 - 2 5/12 = 4 10/12 - 2 5/12 = 2 5/12.
4) 10 4/9 - 8 5/18 = 10 8/18 -8 5/18 = 2 3/18 = 2 1/6.
5) 9 1/2 -2 1/4 = 9 2/4 - 2 1/4 = 7 1/4.
6) 6 3/4 - 2 2/3 = 6 9/12 - 2 8/12 = 4 1/12.
7) 11 3/7 -5 1/3 = 11 9/21 - 5 7/21 = 6 2/21.
8) 8 3/8 - 6 3/10 = 8 15/40 - 6 12/40 = 2 3/40.