What part of speech tells how many?

The part of speech that tells how many is an adjective, specifically a quantifier.

Here's why:

* Adjectives describe nouns, giving us more information about them.

* Quantifiers are a specific type of adjective that tell us the quantity or amount of something.

Examples:

* Two dogs (quantifier "two" tells us the number of dogs)

* Many people (quantifier "many" tells us a large amount of people)

* Some cookies (quantifier "some" tells us an unspecified amount of cookies)

Let me know if you have any other questions!