Introduction to Rational Numbers



Definition: A rational number is a number that can be written in the form p/q, where p and q are integers and q ≠ 0.

All numbers, including whole numbers, integers, fractions and decimal numbers, can be written in the numerator-denominator form..

The denominator of a rational number can never be zero.

Rational Numbers includes the following numbers.

  • Positive and negative fractions
  • Integers
  • Positive and negative terminating and non-terminating repeating decimal numbers.


The fraction a/b indicates division.

For example, the fraction a/b means /7.   The bar () is the fraction symbol.  In mathematics the bar symbol, that is,  the preferred over the slash representation, that is, 5/7..