1 1/8 - 6/8 = 9/8 - 6/8 = 3/8
5 2/5 - 3/5 = 27/5 - 3/5 = 24/5 = 4 4/5
4 4/9 - 5/6 = 40/9 - 5/6 = 80/18 - 15/18 = 65/18= 3 11/18
3 7/16 - 1 5/8 = 55/16 - 26/16= 29/16= 1 13/16
6 2/15 - 3 2/3 = 92/15 - 11/3 = (92-55)/15 =37/15= 2 7/15
12 5/8 - 5 11/12 = 12 15/24 - 5 22/24= 6 17/24