128 : 2 = 64,
128 : 4 = 32,
128 : 8 = 16,
128 : 16 = 8,
128 : 32 = 4,
128 : 64 = 2.

6 + 6 = 12;
12 + 6 = 18;
18 + 6 = 24;
24 + 6 = 30;
6 * 5 = 30;
6 * 3 = 18.