Help your class discover the commutative property of addition with this exploration of the addition table. By folding and coloring the table, a symmetry is found that directs students to an understanding of this crucial mathematical...

Here is a site that clearly and thoroughly explains many rules of algebra, such as the commutative property and the addition property of equality. There are example problems solved, problems for the student to attempt, and answers to the...

An equation is solved using both the addition and multiplication principles of equality. This example can be used as a model for solving similar equations.

This University of Saskatchewan looks at the basic rules of solving inequalities, concentrating on inequalities with absolute values. Includes example problems and exercises with their solutions.

This Purplemath lesson includes many different number properties explained by using examples.

Beginning with a discussion of equivalent equation, this site describes the Addition Principle and how it is used to help solve algebraic equations.