Repeating decimal

A repeating decimal is a decimal number with a digit or a group of digits that repeat on and on, without end. When writing a repeating decimal, a bar is often placed over the repeating portion.

Examples
expressed as a decimal is 0.3333, or 0.3.
expressed as a decimal is 0.1818, or 0.18.

See also nonterminating decimal, terminating decimal.