Usage Note
Ciento apocopates to cien before a noun or when standing alone as an exact hundred: cien personas 'a hundred people', cien euros. The full form ciento is used only in compound numbers from 101 to 199: ciento uno, ciento cincuenta. Por ciento means 'percent'. Unlike English, Spanish does not use 'and' inside hundreds: ciento veinte not ciento y veinte.
Examples
"Hay ciento veinte alumnos en la escuela."
Natural Translation
There are one hundred and twenty students in the school.

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