1 1/4-1/3=1 3/12-4/12=15/12-4/12=11/12
1 1/8-1/4=1 1/8-2/8=9/8-2/8=7/8
1 2/3-5/6=1 4/6-5/6=10/6-5/6=5/6
2 3/10-4/15=1 9/30-8/30=1 1/30
