Quick answer
"Diez" is an adjective which is often translated as "ten", and "treinta" is a noun which is often translated as "thirty". Learn more about the difference between "diez" and "treinta" below.
diez(
dyehs
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. ten
Solo había diez personas en la oficina hoy a causa de la nieve.There were only ten people in the office today because of the snow.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
2. (number)
a. ten
Ella lleva un diez en su camiseta en honor a su jugadora favorita.She wears a ten on her jersey in honor of her favorite player.
b. tenth (in dates)
Celebraremos mi cumpleaños el diez de enero.We'll celebrate my birthday on the tenth of January.
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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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