Final answer:
The correct indefinite article to complete the statement is 'unos'.
Step-by-step explanation:
The correct indefinite article to complete the statement 'Hay mapas en la sala de clase' is unos.
The word 'mapas' is plural, so we need to use the plural indefinite article. In this case, the correct form is 'unos', which means 'some' in English.
For example, we could say 'Hay unos mapas en la sala de clase', which translates to 'There are some maps in the classroom'.
Learn more about Indefinite articles in Spanish