Breakdown of Questi dieci vestiti sono molto cari.
essere
to be
molto
very
questi
these (masculine)
il vestito
the dress / the clothes
Questions & Answers about Questi dieci vestiti sono molto cari.
Does dieci change its ending because it is describing plural masculine clothes?
No, cardinal numbers like dieci (ten) do not change their endings to match the gender or number of the noun they describe. The only exception is uno (one), which changes depending on the noun (like un, una, etc.). For numbers two and up, you just use the base word!
Why do we use Questi instead of Questo?
Why doesn't molto change to molti to match the plural word vestiti?
In this sentence, molto is an adverb meaning "very" because it describes the adjective cari (expensive). Adverbs never change their endings! Molto only changes its ending when it acts as an adjective meaning "much" or "many" to describe a noun directly (like saying molti vestiti for "many dresses").