1-7/12=5/12
8-3/5= 7 2/5
1-6/19= 13/19
5-4/11= 4 7/11
13 3/5-6= 7 3/5
18 4/9 -9 = 9 4/9
12-4 3/4= 7 1/4
18-3 7/15= 14 8/15
10 1/2-4 5/14= 10 7/14-4 5/14= 6 2/14= 6 1/7
2 3/4-1 7/12= 2 9/12-1 7/12= 1 2/12= 1 1/6
5 3/8-3 5/6= 5 9/24 - 3 20/24= 1 13/24
7 1/4-4 5/8= 7 2/8- 4 5/8= 2 5/8