Are number words nouns or adjectives?

Number words can act as both nouns and adjectives, depending on their function in a sentence.

Here's a breakdown:

Nouns:

* When referring to the concept of a number itself: "I need to learn my twos."

* When referring to a specific quantity: "We have a dozen eggs."

* When part of a phrase like "a couple of days."

Adjectives:

* When modifying a noun: "There were five cars in the driveway."

* When describing the quantity of something: "We ate a whole pizza."

Example:

* Noun: "The hundreds are a challenging part of multiplication."

* Adjective: "We waited for three hours."

Let me know if you have any other questions!