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

Examples
El profesor encontró muchos errores en mi ensayo.
The teacher found many mistakes in my essay.
Todos cometemos errores, es parte de aprender.
We all make mistakes, it's part of learning.
Los errores de cálculo costaron a la empresa una fortuna.
The calculation errors cost the company a fortune.
Plural Form
This word is the plural form of the masculine noun 'error'. Since 'error' ends in 'r', you add '-es' to make it plural.
Gender Consistency
Because 'error' is masculine, its plural 'errores' is also masculine. Always use masculine articles with it: 'los errores' (the mistakes).
Using the wrong verb for 'making' a mistake
Mistake: “Hacer errores”
Correction: Cometer errores. In Spanish, you usually 'commit' (cometer) a mistake, rather than 'do' or 'make' (hacer) one.
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