Decimal vs. Binary
4Decimal (base 10)
–124 = 100 + 20 + 4
–124 = 1 ´ 102 + 2 ´ 101 + 4 ´ 100
4Binary (base 2)
–1111100 = 64 + 32 + 16 + 8 + 4 + 0 + 0
–1111100 = 1 ´ 26 + 1 ´ 25 + 1 ´ 24 + 1 ´ 23                  + 1 ´ 22 + 0 ´ 21 + 0 ´ 20