Quick answer
"Forties" is a plural noun which is often translated as "los años cuarenta", and "thirties" is a plural noun which is often translated as "los años treinta". Learn more about the difference between "forties" and "thirties" below.
forties
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
1. (decade)
a. los años cuarenta
(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).
World War II ended in the forties, right?La Segunda Guerra Mundial terminó en los años cuarenta, ¿no?
2. (approximate age)
a. cuarenta y pico (colloquial)
How old do you think Mrs. Smith is? - I think she's in her forties. ¿Cuántos años le calculas a la Sra. Smith? - Creo que tiene cuarenta y pico.
forty
An adjective is a word that describes a noun (e.g. the big dog).
3. (number)
a. cuarenta
Bring a box with forty slots, or two boxes with twenty slots each.Trae una caja con cuarenta ranuras o dos cajas con veinte ranuras cada una.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (number)
a. el cuarenta
(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).
La raíz cuadrada de mil seiscientos es cuarenta.The square root of sixteen hundred is forty.
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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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