97 : 12 = 8 (ост.1)
12 * 7 = 84
12 * 8 = 96
12 * 9 = 108
97 - 96 = 1
---------------------------------
60 : 52 = 1(ост.8)
52 * 0 = 0
52 * 1 = 52
52 * 2 = 104
60 - 52 = 8
-------------------------------------
920 : 102 = 9 (ост.2)
102 * 8 = 816
102 * 9 = 918
102 * 10 = 1020
920 - 918 = 2