What are all the ways to classify each number? (whole number integer, or rational number. -5

Explanation:

The set of whole numbers is {0,1,2,3,4,...} which consists of positive values and 0. So we can cross "whole numbers" off the list since -5 is negative.

The set of integers is {..., -3, -2, -1, 0, 1, 2, 3, ...} which now considers the negative whole numbers. The value -5 is in this list. So -5 is an integer.

It's also a rational number because -5 = -5/1 showing it is a fraction or ratio of two integers.