How to Say "one-third" in Spanish
The Spanish word for “one-third” is “tercio” — A2 level. This is a very common word in everyday Spanish.

Examples
Solo comí un tercio de la pizza.
I only ate one-third of the pizza.
Casi un tercio de los estudiantes faltó a clase.
Almost a third of the students missed class.
Añade un tercio de taza de azúcar a la mezcla.
Add one-third of a cup of sugar to the mixture.
Using 'un' before tercio
In Spanish, you must use 'un' (a/one) before 'tercio' when stating a specific fraction, just like you say 'a third' in English.
Matching the word it describes
The word 'tercio' itself is always masculine. Even if you are talking about a feminine thing (like 'la pizza'), you still use 'un tercio'.
Confusing 'tercio' with 'tercero'
Mistake: “Quiero el tercero de la tarta.”
Correction: Quiero un tercio de la tarta.
Related Translations
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