How to Say "fifties" in Spanish
The Spanish word for “fifties” is “cincuenta” — A1 level. This is a very common word in everyday Spanish.

Examples
Necesito cincuenta minutos para terminar este trabajo.
I need fifty minutes to finish this work.
Mi padre tiene cincuenta años y sigue jugando al fútbol.
My father is fifty years old and still plays soccer.
La entrada al museo cuesta cincuenta pesos.
Admission to the museum costs fifty pesos.
Always Unchanging
Unlike the number 'uno' (which changes to 'un' or 'una'), 'cincuenta' always stays the same, whether you are counting masculine nouns (cincuenta libros) or feminine nouns (cincuenta mesas).
Writing Large Numbers
In Spanish, the numbers from 31 to 99 are usually written as three separate words (e.g., 'cincuenta y uno', 'fifty-one').
Adding an 's'
Mistake: “Using 'cincuentas' when counting things.”
Correction: The number itself never takes an 's' when counting items. Only use 'las cincuentas' when referring to the decade or age range (e.g., 'She is in her fifties').
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