What is the decimal number 133 in binary?

Answer 1

The binary number equivalent of 133 is 10000101.

(which for clarity can be grouped, e.g. 1000 0101).

A binary number uses exponents of 2 rather than 10, and the first eight digits represent

128, 64, 32, 16, 8, 4, 2, and 1

10000101 = 128 +0+0+0+0+4+0+1 = 133