Quick answer
"Fifties" is a plural noun which is often translated as "los años cincuenta", and "thirties" is a plural noun which is often translated as "los años treinta". Learn more about the difference between "fifties" and "thirties" below.
fifties
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
1. (decade)
a. los años cincuenta
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
What important events happened during the fifties?¿Cuáles eventos importantes tuvieron lugar durante los años cincuenta?
2. (approximate age)
a. cincuenta y pico
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
My dad is in his fifties, but he looks younger. Mi papá tiene cincuenta y pico, pero se ve más joven.
b. cincuenta y tantos
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
How old is your Spanish teacher? - I think she's in her fifties.¿Qué edad tiene tu profesora de español? - Creo que tiene cincuenta y tantos.
fifty
An adjective is a word that describes a noun (e.g. the big dog).
3. (number)
a. cincuenta
There are fifty houses in our neighborhood.Hay cincuenta casas en nuestro vecindario.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (number)
a. el cincuenta
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Ten times five is fifty.Diez veces cinco son cincuenta.
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thirties
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
1. (decade)
a. los años treinta
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
My grandfather was born in the thirties.Mi abuelo nació en los años treinta.
2. (approximate age)
a. treinta y pico (colloquial)
When she was in her thirties she moved to France. Cuando tenía treinta y pico se mudó a Francia.
thirty
An adjective is a word that describes a noun (e.g. the big dog).
3. (number)
a. treinta
I was born thirty years ago.Nací hace treinta años.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (number)
a. el treinta
(m) means that a noun is masculine. Spanish nouns have a gender, which is either feminine (like la mujer or la luna) or masculine (like el hombre or el sol).
Thirty is my favorite number.El treinta es mi número favorito.
5. (used to express time)
a. y media
What's the time? - It's two thirty.¿Qué hora es? - Son las dos y media.
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