Quick answer
"Fifties" is a plural noun which is often translated as "los años cincuenta", and "nineties" is a plural noun which is often translated as "los años noventa". Learn more about the difference between "fifties" and "nineties" 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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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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