I have three cats.

I have a fractional number of apples.

The movie had a catchy item number that got everyone dancing.

The item numbers on the list are incorrect.

Hailstone numbers are a sequence of positive integers that follow a specific set of rules.

A hailstone number is a positive integer that follows a specific sequence of steps in a mathematical algorithm.

The Pell number sequence is a series of numbers in mathematics.

Pell numbers are a sequence of integers that start with 0 and 1, and each subsequent number is the sum of twice the previous number and the number before it.

These rookie numbers won't cut it in the big leagues.

The store will be closed tomorrow.