3 1/12-1/6=37/12-1/6= 37-2/12=35/12
8 7/30- 2 9/20= 247/30- 49/20 = 494-147/60=347/60
7 10/51-4 21/34= 367/51-157/34=734-471/102=263/102
4 3/16-5/8=67/16-5/8=67-10/16=57/16
6 4/9- 3 6/7= 58/9-27/7=406-243/63=163/63
10 11/24 - 8 19/36 = 251/24 - 307/36 = 753-614/72= 139/72