Regles de formation, exceptions et usages
Les trois premiers ordinaux sont completement irreguliers et doivent etre memorises :
| Cardinal | Ordinal | Abreviation |
|---|---|---|
| one (1) | first | 1st |
| two (2) | second | 2nd |
| three (3) | third | 3rd |
Pour former un ordinal, on ajoute -th au nombre cardinal. Mais attention aux modifications orthographiques :
| Cardinal | Ordinal | Changement |
|---|---|---|
| four | fourth | Ajout simple de -th |
| five | fifth | ve → f + th |
| six | sixth | Ajout simple |
| seven | seventh | Ajout simple |
| eight | eighth | Un seul "t" (pas "eightth") |
| nine | ninth | On supprime le "e" final |
| ten | tenth | Ajout simple |
| eleven | eleventh | Ajout simple |
| twelve | twelfth | ve → f + th |
| Cardinal | Ordinal | Abreviation |
|---|---|---|
| thirteen | thirteenth | 13th |
| fourteen | fourteenth | 14th |
| fifteen | fifteenth | 15th |
| sixteen | sixteenth | 16th |
| seventeen | seventeenth | 17th |
| eighteen | eighteenth | 18th |
| nineteen | nineteenth | 19th |
Pour les dizaines, le y final se transforme en ie avant d'ajouter -th :
| Cardinal | Ordinal | Transformation |
|---|---|---|
| twenty | twentieth | y → ieth |
| thirty | thirtieth | y → ieth |
| forty | fortieth | y → ieth |
| fifty | fiftieth | y → ieth |
| sixty | sixtieth | y → ieth |
| seventy | seventieth | y → ieth |
| eighty | eightieth | y → ieth |
| ninety | ninetieth | y → ieth |
Seul le dernier mot prend la forme ordinale :
| Nombre | Ordinal | Abreviation |
|---|---|---|
| 21 | twenty-first | 21st |
| 32 | thirty-second | 32nd |
| 43 | forty-third | 43rd |
| 55 | fifty-fifth | 55th |
| 68 | sixty-eighth | 68th |
| 99 | ninety-ninth | 99th |
| 100 | one hundredth | 100th |
| Contexte | Exemple |
|---|---|
| Dates | The meeting is on the 5th of January. |
| Classements | She finished third in the race. |
| Etages | My office is on the fourth floor. |
| Siecles | The twenty-first century. |
| Anniversaires | Happy thirtieth birthday! |
| Fractions | One fifth of the students passed. |
A. Ecrivez l'ordinal en toutes lettres :
1. 8 →
2. 12 →
3. 31 →
4. 45 →
5. 72 →
B. Completez avec l'abreviation correcte :
1. 1 (premier)
2. 2 (deuxieme)
3. 3 (troisieme)
4. 11 (onzieme)
5. 23 (vingt-troisieme)