__Real Number System__

You can divide the real numbers into two major groups: **Rational & Irrational.**

**Irrational **numbers are numbers that can be made into a decimal that goes on forever, but it does not repeat or terminate(end). For example, an irrational number can look like this 3.56469882224689....

All other real numbers are classified as **rational.**

**Rational numbers** can be subgrouped into **natural numbers, whole numbers, and integers.**

**Natural numbers** are the counting numbers. 1,2,3,....

**Whole numbers** are natural numbers plus zero. 0,1,2,3...

I**ntegers** are whole numbers plus their opposites. ...,-2,-1,0,1,2,...

All of those subgroups are** rational numbers,** but **rational numbers** can be decimals too (as long as they repeat or terminate). For example, some rational numbers are 3.45498, 2.3333333..., 8.5

Here is a chart that may help you visualize classifying real numbers: