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"Son las tres" is a phrase which is often translated as "it's three o'clock", and "treinta" is a noun which is often translated as "thirty". Learn more about the difference between "son las tres" and "treinta" below.
son las tres(
sohn
lahs
trehs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. it's three o'clock
Son las tres y acabamos de almorzar. ¿Qué tal una siestecita ahora?It's three o'clock and we've just finished lunch. What about a little siesta now?
el treinta(
treyn
-
tah
)A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
2. (number)
b. thirtieth (in dates)
El cumpleaños de mi padre es el treinta de noviembre.My father’s birthday is on the thirtieth of November.