It goes in 64 times.
12/64 as a percentage = 100*12/64 = 18.75%
12 with 4 remainder
12 with remainder 16.
64 with remainder 11.
Five times... with a remainder of 12.
64+32+12=108
5 with a remainder of 4
64+12 = 76
64 twos go into 128.This is not hard to do. If you look at the first two figures - 12 - and ask how many twos in 12 the answer is 6 (6x2=12). Then look at the last figure - 8 - and ask how many twos in eight, the answer is 4 (2x4=8). The answer is 64.
12/64 or 3/8
12 bit binary of -64 = -52