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Quick answer
"Un" is an indefinite article which is often translated as "a", and "treinta" is a noun which is often translated as "thirty". Learn more about the difference between "un" and "treinta" below.
An indefinite article is a word that indicates that a noun is not specific (e.g. a girl).
1. (singular)
a. a
Había un coche estacionado en la puerta.There was a car parked at the gate.
b. an (before vowel sound)
Tienen una vieja cámara que todavía funciona.They have an old camera which is still working.
2. (plural)
a. some
Compré unos libros muy interesantes.I bought some very interesting books.
Conseguí unas manzanas deliciosas en el mercado.I got some delicious apples at the market.
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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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