Learn Italian: Il museo ha novanta quadri. - The museum has ninety paintings.

No, cardinal numbers like novanta (ninety) do not change their endings. Except for the number one (uno or una), Italian numbers stay exactly the same regardless of whether the noun they describe is masculine, feminine, singular, or plural.

Is novanta related to the word for nine?

Yes! The number nine is nove, and ninety is novanta. Most of the tens in Italian end in -anta (like quaranta for forty and cinquanta for fifty), which makes them easier to remember.

What is the singular form of quadri?

The singular is quadro, which means painting, picture, or square. Because it is a masculine noun ending in -o, its plural form ends in -i.

How do I pronounce the word ha?

The h is completely silent, so it sounds exactly like the letter a (pronounced 'ah'). The silent h is used in spelling to tell the verb ha (he/she/it has) apart from the preposition a (to/at).