# Ordinal numbers

An ordinal number is a number used to tell order, or position. Each ordinal number can be paired with a cardinal number (a whole number that tells how many are in a group.)

Examples

Ordinal number | Cardinal number |

first | one, or 1 |

second | two, or 2 |

third | three, or 3 |

fourth | four, or 4 |

tenth | ten, or 10 |

twenty-first | twenty-one, or 21 |

hundredth | one hundred, or 100 |

Related word order.

See also cardinal numbers.