# Difference between revisions of "Ordinal number"

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− | An '''ordinal number''' is a [[number]] that is used to describe a set of objects in order, as in a [[list]]. | + | An '''ordinal number''' is a [[number]] that is used to describe a set of objects in order, as in a [[list]]. Contrast [[cardinal number]]. |

In [[English]], the ordinal numbers are: | In [[English]], the ordinal numbers are: |

## Revision as of 14:34, 4 December 2019

An **ordinal number** is a number that is used to describe a set of objects in order, as in a list. Contrast cardinal number.

In English, the ordinal numbers are:

first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, twenty-first, twenty-second, twenty-third, etc.

These are usually first encountered by students with regard to dates, for which they will need ordinal numbers up to thirty-first.

Regular ordinal numbers end in -th; irregular ordinal numbers are the first, second, third. Students may over-regularise these and say e.g. *"oneth", *"twoth", *"threeth", possibly with a 10x number as well, e.g. *"twenty-twoth".

These can be used as pronouns, e.g. "the first", etc.

Students often struggle with the /θ/ sound.