A real number is any number that you can find on a number line. This includes rational and irrational numbers, which means positive numbers, negative numbers, decimal numbers, square root numbers and even pi.

The teacher defines and writes a list of the different categories of numbers. But sometimes it's hard to keep all that organized. So she draws a diagram and explains further how the categories of numbers compare or relate to each other....

This lesson discusses both the myths that can be found at the base of many religions, as well as the view that contemporary religious practice is in fact just a vestige of older, non-rational modes of thought. It is 4 of 4 in the series...

Real numbers are numbers that can be found on the number line and can be either a rational or irrational number. This tutorial explains real numbers and gives some examples. [2:57]

This lesson discusses both the myths that can be found at the base of many religions, as well as the view that contemporary religious practice is in fact just a vestige of older, non-rational modes of thought. It is 1 of 4 in the series...