
Gives a detailed explanation of how to use interval notation, followed by numerous examples, from very simple to quite complex.
Connexions

Some worked example problems that point out many common errors students make when solving them.
Pauls Online Math Notes

In this Early Edge video lesson, you'll learn more about Positive/Negative/Even/Odd Numbers, so you can be successful when you take on highschool Math & Arithmetic.
The Princeton Review

In this Early Edge video lesson, you'll learn more about TwoStep Equations, so you can be successful when you take on highschool Math & Algebra.
The Princeton Review

Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes

This page describes the sets of numbers, natural, whole, integers, rational, irrational and real numbers. Gives examples and organizes the information well.
Virtual Math Lab by Texas A&M University

Multiple Choice practice with properties of Algebra with an explanation.
math.com

Explains what Natural Numbers, Whole Numbers, Integers, Rational Numbers, Irrational Numbers, and Real Numbers are.
Understanding Algebra

Practice Quiz on Real Numbers, their properties, and their operations
Algebra Lab
