Quick answer
"Dos mil" is an adjective which is often translated as "two thousand", and "treinta" is a noun which is often translated as "thirty". Learn more about the difference between "dos mil" and "treinta" below.
dos mil(
dohs
 
meel
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. two thousand
Hay dos mil especies de insectos en estos bosques.There are two thousand species of insects in this woods.
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treinta(
treyn
-
tah
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. thirty (cardinal)
La cuenta fue de treinta dólares. The bill was for thirty dollars.
b. thirtieth (ordinal)
Mis padres celebraron su treinta aniversario de boda la semana pasada.My parents celebrated their thirtieth wedding anniversary last week.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
2. (number)
a. thirty
Diez por tres es igual a treinta. Ten times three is equal to thirty.
b. thirtieth (in dates)
El cumpleaños de mi padre es el treinta de noviembre.My father’s birthday is on the thirtieth of November.
3. (decade)
a. thirties
Mi familia se mudó de España a los Estados Unidos en los treinta.My family moved from Spain to the United States in the thirties.
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