In the answers below, we use R to show the remainder.

8 / 2 = 4
15 / 3 = 5
12 / 4 = 3
7 / 3 = 2,   R = 1
15 / 4 = 3,   R = 3
16 / 4 = 4
14 / 3 = 4,   R = 2
25 / 5 = 5