Accompanying Resource:
Classifying Rational Numbers Boom Cards 
Did you know that numbers haven't been around forever? Way back when, people didn't have words or symbols for numbers as simple as 1, 2, 3. . . Before numbers and their symbols were invented, people used sticks and made tally marks on stones as ways to keep track of things. Thankfully, a number system developed over time so we no longer need to use sticks or hold up fingers to count! We now have names and symbols that we use to represent numbers. (Want to see some of the earlier symbols that were used? Check out this article on the history of the number system.)

Here's a graphic organizer to help you understand how these three types of numbers are related to each other. The whole numbers are inside of the integers in the diagram because all of the whole numbers are also integers. The integers are inside of the rational numbers in the diagram because all of the integers are also rational numbers.
