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"Son las siete" is a phrase which is often translated as "it's seven o'clock", and "quince" is an adjective which is often translated as "fifteen". Learn more about the difference between "son las siete" and "quince" below.
son las siete(
sohn
 
lahs
 
syeh
-
teh
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. it's seven o'clock
Son las siete. Tenemos que irnos ya mismo o perderemos el tren.It's seven o'clock. We need to leave right now or we'll miss the train.
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quince(
keen
-
seh
)
An adjective is a word that describes a noun (e.g., the big dog).
adjective
a. fifteen
Tienes que escribir quince páginas.You have to write fifteen pages.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. fifteen
Siete más ocho son quince.Seven plus eight is fifteen.
b. fifteenth (in dates)
A Julio César lo asesinaron el quince de marzo.Julius Caesar was assassinated on the fifteenth of March.
a. fifteenth birthday
Mariluz está deseando celebrar sus quince.Mariluz is looking forward to celebrating her fifteenth birthday.
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