Ordinal Numbers in English: 1st, 2nd, 11th — and Why Not 11st
The ending comes from the last word you say, not the last digit you write. That one idea explains 21st, 11th and 112th.
Ordinal numbers are the ones that put things in order: first, second, third, eleventh, twenty-first. English writes them as a digit plus two letters — 1st, 2nd, 3rd, 11th — and the two letters follow a rule with one famous exception. This guide covers the rule, the exception, and how ordinals actually sound when someone says them quickly.
The rule: look at the last word you say
The ending is not chosen by the last digit. It is chosen by the last word of the spoken number:
- Ends in "first" → -st: 1st, 21st, 31st, 101st
- Ends in "second" → -nd: 2nd, 22nd, 42nd, 102nd
- Ends in "third" → -rd: 3rd, 23rd, 53rd, 103rd
- Everything else → -th: 4th, 9th, 20th, 100th
The letters are simply the last two letters of the word: first, second, third, fourth. Once you see that, the exception stops being strange.
Why 11th, not 11st
11 ends in the digit 1, so it looks like it should be "11st". But you do not say "one-first". You say eleventh — one word, ending in "-th". The same goes for 12 and 13:
| Number | Spoken | Written | Not |
|---|---|---|---|
| 11 | eleventh | 11th | 11st |
| 12 | twelfth | 12th | 12nd |
| 13 | thirteenth | 13th | 13rd |
| 111 | one hundred and eleventh | 111th | 111st |
| 112 | one hundred and twelfth | 112th | 112nd |
The exception follows the numbers into the hundreds and thousands. Any number ending in 11, 12 or 13 takes "-th": 211th, 1,012th, 613th. Compare 21st, 101st and 121st, which do end in the word "first".
The irregular spellings
Most ordinals just add "-th" to the number word — sixth, seventh, fourteenth. A handful change their spelling, and these are the ones people get wrong in writing:
- one → first, two → second, three → third
- five → fifth (not "fiveth")
- eight → eighth (only one "t")
- nine → ninth (the "e" is dropped)
- twelve → twelfth (the "v" becomes "f")
- twenty → twentieth, thirty → thirtieth — every "-ty" number becomes "-tieth"
In compound numbers only the last word changes: twenty-first, forty-fifth, ninety-ninth. The first part stays a normal number.
How ordinals sound at speed
Reading ordinals is easy once you know the rule. Hearing them is harder, because the ending is a soft "-th" sound that often disappears in fast speech. "The fifth" and "the fifteenth" can blur, and the classic trap is the teen/ty pair:
| Pair | What separates them |
|---|---|
| 13th / 30th | thir-TEENTH vs THIR-tieth |
| 14th / 40th | four-TEENTH vs FOR-tieth |
| 19th / 90th | nine-TEENTH vs NINE-tieth |
The "-teenth" form puts the stress at the end; the "-tieth" form puts it at the front and adds an extra syllable. That extra "-i-eth" is often the clearest clue — "thirtieth" has three syllables, "thirteenth" has two.
Where you will hear ordinals
- Dates: "the twenty-second of May", "June eleventh". The written date may show a plain digit, but the spoken date is almost always an ordinal — how to say dates out loud covers this in detail.
- Floors: "the third floor". In British English the ground floor comes first, so the British "first floor" is the American "second floor".
- Birthdays and anniversaries: "her twenty-first", "our fiftieth".
- Rankings and races: "she came second", "the hundredth customer".
- Centuries: "the twenty-first century" (the 2000s), one ahead of the year's first digits.
- Fractions: a third, a quarter (or "a fourth" in American English), three-fifths.
Training the ear
The written rule takes five minutes to learn. Catching "the thirteenth" versus "the thirtieth" in a fast phone call takes practice, because there is no time to think about it. The quickest way to build that is short dictation: hear a number, type it, check it, and repeat until the teen/ty difference is automatic. If the basic number names are still slow for you, start with English number names from 1 to 100 — ordinals are built on top of them.
