A rational number 1) is any number that can be expressed as the quotient or fraction p/q of two integers
Rational numbers are also known as:
The syntax of a rational number is expressed via a division operator:
<MATH> \frac{\displaystyle p}{\displaystyle q} = \frac{\displaystyle \text{p (numerator)}}{\displaystyle \text{q (non-zero denominator)}} </MATH>
Since the non-zero denominator q may be equal to 1, every integer is a rational number.
The rational numbers together with addition and multiplication form field which contains the integers and is contained in any field containing the integers.
The set of rational numbers is countable.
See also rational number in measurement: Statistics - (Fraction|Ratio|Percentage|Share) (Variable|Measurement)