What is binary 11111111 equal to as a decimal?

Answer 1

11111111 = 255 in standard binary. think of it like so: 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 1 1 1 1 1 1 1 1

in other words, (1x128) + (1x64) etc. etc. In Signed Binary however, this would equal -127 since in signed binary, the first bit represents the sign for plus or minus. e.g 0 = +, 1 = -. as such: Plus or minus | 64 | 32 | 16 | 8 | 4 | 2 | 1 1 (-) 1 1 1 1 1 1 1

Answer 2

31 is the correct answer.

We arrive at the answer by the following process:

24 + 23 + 22 + 21 + 20 = 16+8+4+2+1=31 in decimal.

Answer 3

37