2) 1 - 15/16 = 16/16 - 15/16 = 1/16
4) 3 - 2/15 = 2 целых 15/15 - 2/15 = 2 целых 13/15
8) 37/12 - 2 = 3 целых 1/12 - 2 = 1 целая 1/12
10) 12 3/4 - 9 7/8 = 12 6/8 - 9 7/8 = 11 14/8 - 9 7/8 = 2 целых 7/8
12) 30 - 25 1/5 = 29 целых 5/5 - 25 целых 1/5 = 4 целых 4/5