How to Say "-th" in Spanish
The Spanish word for “-th” is “ava” — B2 level.
Examples
Le corresponde una onceava parte de la herencia.
He is entitled to an eleventh part of the inheritance.
Dividió el terreno en una doceava porción para cada hijo.
He divided the land into a twelfth portion for each child.
Solo me queda una dieceava de la pizza.
I only have one tenth of the pizza left.
The Fraction Rule
From the number 11 onwards, Spanish uses the ending '-ava' (feminine) or '-avo' (masculine) to name parts of a whole. It works just like adding '-th' in English (e.g., eleventh, twelfth).
Matching with 'Parte'
Since the word 'parte' (part) is feminine in Spanish, you will almost always see this ending used as 'ava' to match it: 'la onceava parte'.
Position vs. Fraction
Mistake: “Using 'onceava' to mean 11th in a race (position).”
Correction: Use 'undécima' for position (11th place) and 'onceava' for a slice (1/11th).
Spelling Confusion
Mistake: “Writing 'aba' when you mean 'ava'.”
Correction: Remember that 'habas' are beans (with an H and B), while '-ava' is for numbers.
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