How do you write a sentence with number serving as an adjective?

Here are some examples of sentences with numbers serving as adjectives:

* "Two" students raised their hands.

* She ordered three pizzas for the party.

* I saw five cars parked in the driveway.

* He ate ten cookies in one sitting.

In each example, the number acts as an adjective modifying the noun that follows it (students, pizzas, cars, cookies).