It is 'quince' (pronounced 'KEENthay') ('th' as in 'thin')
Quince
quince - which sounds like 'keen-say'
quince dias
The number fifteen (15) is quince.quince
Las nueve y cuarto.
Fifteen trillion.
To say "he is fifteen" in Spanish, you would say "él tiene quince años." Literally, this means "he has fifteen years." That may seem a little odd to English speakers, but that is how a person's age is described in Spanish.
three one five, three fifteen, three hundred and fifteen,
One million six thousand fifteen in Spanish is "un millón seis mil quince."
The number 815 is "ochocientos quince" (eight hundred fifteen)
Cuatro Quince
To say "it's four fifteen" in Spanish, you would say "son las cuatro y quince" or simply "son las cuatro y cuarto." The phrase "y cuarto" specifically means "and a quarter," indicating that it's a quarter past four.