How do you convert 13 into a binary number?

Answer 1

Binary numbers start at the right and go left. The first column on the right is 1, the next is 2, then 4, with each column doubling in value from the previous column. So 13 is written as 1101which means (1 x 8) + (1 x 4) = (0 x 2) + (1 x 1) = 13