7305 = 7 × 10^{3}+ 3 × 10^{2}+ 0 × 10^{1}+ 5 × 10^{0}

For
base 10 representation
(often called *decimal representation*),
the rules of positional notation are:

- The base is 10.
- There are 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 .
- Positions correspond to integer powers of 10, starting with power 0 at the rightmost digit, and increasing right to left.
- The digit placed at a position shows how many times that power of 10 is included in the number.

A compact way of writing this is:

Any integer can serve as the base for a positional representation system. Five can serve as a base.