The hexadecimal works just the same as the decimal, octal and binary systems, except that the base is 16. For example
Recall that in the binary system we needed two bits (0,1), while in octal we will only need eight numbers (0,1,2,3,5,6,7) and in decimal we need the ten digits 0 through 9. To use base-16 we will need 16 different symbols to play the role of digits. We use
Given this, we can express