Quick answer
"Forties" is a plural noun which is often translated as "los años cuarenta", and "nineties" is a plural noun which is often translated as "los años noventa". Learn more about the difference between "forties" and "nineties" 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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nineties
A plural noun indicates that there is more than one person, place, thing, or idea.
plural noun
1. (decade)
a. los años noventa
(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).
Nirvana was one of the most popular bands in the world in the nineties. Nirvana fue una de las bandas más populares del mundo en los años noventa.
2. (approximate age)
a. noventa y pico
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
My grandmother is in her nineties and still loves to knit.Mi abuela tiene noventa y pico, y todavía le encanta tejer.
b. noventa y tantos
A word or phrase that is commonly used in conversational speech (e.g. skinny, grandma).
(colloquial)
The women in my family live into their nineties.Las mujeres de mi familia viven hasta los noventa y tantos.
ninety
An adjective is a word that describes a noun (e.g. the big dog).
3. (number)
a. noventa
There are ninety minutes in a soccer match.Hay noventa minutos en un partido de fútbol.
A noun is a word referring to a person, animal, place, thing, feeling or idea (e.g. man, dog, house).
4. (number)
a. el noventa
(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).
Fifteen times six is ninety.Quince por seis es igual a noventa.
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