Ordinal numbers from 11 to 20

These are the ordinal numbers from 11 to 20:

11º/ª (11th) → Decimoprimero/a or undécimo/a (eleventh)
12º/ª (12th) → Decimosegundo/a or duodécimo/a (twelfth)
13º/ª (13th) → Decimotercero/a (thirteenth)
14º/ª (14th) → Decimocuarto/a (fourteenth)
15º/ª (15th) → Decimoquinto/a (fifteenth)

16º/ª (16th) → Decimosexto/a (sixteenth)
17º/ª (17th) → Decimoséptimo/a (seventeenth)
18º/ª (18th) → Decimoctavo/a (eighteenth)
19º/ª (19th) → Decimonoveno/a (nineteenth)
20º/ª (20th) → Vigésimo/a (twentieth)

Notes:

  • The ordinal numbers agree in gender and number with the noun they accompany.

Es mi decimosexto marido.

He is my sixteenth husband.

Es mi duodécima pinta de cerveza.

This is my twelfth pint of beer.

  • Primero (first) and tercero (third) change to primer and tercer before masculine nouns.

Me regalaron una tortuga para mi decimotercer cumpleaños.

They gave me a tortoise for my thirteenth birthday.



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