Los números ordinales (first, second, third...) indican orden o posición.
| # | Ordinal | Abrev. | # | Ordinal | Abrev. |
|---|---|---|---|---|---|
| 1 | first | 1st | 11 | eleventh | 11th |
| 2 | second | 2nd | 12 | twelfth | 12th |
| 3 | third | 3rd | 13 | thirteenth | 13th |
| 4 | fourth | 4th | 20 | twentieth | 20th |
| 5 | fifth | 5th | 21 | twenty-first | 21st |
| 6 | sixth | 6th | 22 | twenty-second | 22nd |
| 7 | seventh | 7th | 23 | twenty-third | 23rd |
| 8 | eighth | 8th | 30 | thirtieth | 30th |
| 9 | ninth | 9th | 31 | thirty-first | 31st |
| 10 | tenth | 10th | 100 | one hundredth | 100th |
| Regla | Cardinal | Ordinal |
|---|---|---|
| Irregulares (memorizar) | one, two, three, five, eight, nine, twelve | first, second, third, fifth, eighth, ninth, twelfth |
| General: + th | four, six, seven, ten | fourth, sixth, seventh, tenth |
| -ty → tieth | twenty, thirty, forty | twentieth, thirtieth, fortieth |
| Compuestos: solo cambia el último | twenty-one | twenty-first |
Repasa los conceptos clave de esta lección.
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