# Numbers: Ordinal Numbers

Imagine that you are on a list and you want to know where you are standing. To refer to that number, we use 'ordinal numbers.'

## What Are Ordinal Numbers?

Ordinal numbers are used to show the position of something in a list or in a row, that's why we call them ordinal.

## How to Write Ordinal Numbers: 1-10

Except for the first three numbers, most of the numbers get 'th' at the end to change to an ordinal number:

Written | Numeral |
---|---|

first | 1st |

second | 2nd |

third | 3rd |

fourth | 4th |

fifth | 5th |

sixth | 6th |

seventh | 7th |

eighth | 8th |

ninth | 9th |

tenth | 10th |

### Exceptions in Spelling

Please note that apart from 1st, 2nd, and 3rd, some of the numbers change form when adding 'th' to them.

- fi
ve + th → fifth - eigh
t + th → eighth - nin
e + th → ninth

## How to Write Ordinal Numbers: 11-20

Written | Numeral |
---|---|

eleventh | 11th |

twelfth | 12th |

thirteenth | 13th |

fourteenth | 14th |

fifteenth | 15th |

sixteenth | 16th |

seventeenth | 17th |

eighteenth | 18th |

nineteenth | 19th |

twentieth | 20th |

### Exceptions in Spelling

As you can see in the table above, some of the numbers change form when adding 'th' to them.

- twel
ve + th → twelf th - twent
y + th → twentie th

## How to Write Ordinal Numbers: Compound

For compound ordinal numbers, use this structure:**first part (in cardinal form) + hyphen + second part (ordinal form)**

Written | Numeral |
---|---|

twenty-first | 21st |

twenty-second | 22nd |

twenty-third | 23rd |

twenty-fourth | 24th |

twenty-fifth | 25th |

twenty-sixth | 26th |

twenty-seventh | 27th |

twenty-eighth | 28th |

twenty-ninth | 29th |

## How to Write Ordinal Numbers: The Tens

For the tens, note that the letter 'y' at the end of the cardinal number, turns into 'ie' in ordinal numbers.

Written | Numeral |
---|---|

tenth | 10th |

twentieth | 20th |

thirtieth | 30th |

fortieth | 40th |

fiftieth | 50th |

sixtieth | 60th |

seventieth | 70th |

eightieth | 80th |

ninetieth | 90th |

## How to Write Ordinal Numbers: The Hundreds

To write a number from 100 to 999 in ordinal form, first, write the number of hundreds.

If nothing is left over, write the word 'hundredth.'

If there is more number, write the word 'hundred,' then write the rest of the numbers.

Written | Numeral |
---|---|

one hundred first | 101st |

one hundred second | 102nd |

one hundred third | 103rd |

two hundred seventy-fifth | 275th |

three hundredth | 300 |

five hundred eighty-ninth | 589th |

nine hundred ninety-eighth | 998 |