When writing a rational number in decimal notation, a group of digits that repeats in the decimal part of the number.

### Symbol

In the decimal notation of a rational number, the notation of the period *p* consists of drawing a line over the sequence of numbers that repeats.

In the decimal notation of the rational number \(\dfrac {22} {7}\) = 3.142 857 142 857 14 …, the period is 142 857.

\(\dfrac {22} {7} = 3.\overline {142\space857}\) and we write: *p* = 142 857.

### Examples

- \(\dfrac{5}{3}\) = 1.666 666 666 … = 1.\(\overline {6}\) and we write:
*p*= 6. - If the rational number is one decimal number, the period is 0.

\(\dfrac{7}{5}\) = 1.4 and we write:*p*= 0.