The Real Number System

Rational? Irrational?

Rational Numbers

Rational numbers are numbers that are predictable. Whether they are repeating or not, any number that can be written as a fraction is rational.
Whole numbers are rational, they are numbers such as 130, 12, 40, etc..
Integers are whole numbers and their opposites, such as 40, -40, 30, -30, etc.
Natural numbers are the smallest classification of rational numbers, they are numbers that you could count such as 1,2,3 and so on..

Irrational Numbers

Irrational numbers are the most specific group of their category. They are numbers that are unpredictable. They can't be written as fractions, therefore they aren't rational. They do not repeat nor do they terminate. This is what makes numbers such as Pi irrational.

This presentation on The Real Number System was made by Jonathan Kaiko.