What is binary 100110 in decimal?

Answer 1

The answer is 38. Break down the digits like this:

1 0 0 1 1 0

Going right to left, each position represents a higher power of 2, starting with 2^0, which is one, so right the powers of two under the digits, ascending as you move to the left:

1 0 0 1 1 0

32 16 8 4 2 1

Then, just multiply each binary digit by the value below, and you get: 32 + 4 + 2 = 38.