• The decimal number system that we use every day has 10 digits {0,1,2,3,4,5,6,7,8,9} and so the radix is 10 (also called Base 10). • Binary digits can only be 0 or 1, so the radix is 2 (or Base 2). Exponents (Powers): the number that is going to be raised to a power. Example: in 8 2, 8 is the radix (more commonly called the base)