This section of the Energy Conservation Enhancement Project was originally created for the vocational technical schools in Louisiana. Much of the material contained within is generic in content and may be applied and used by many people throughout the world. Topics include The Pluses and the Minuses, What is Algebra? Algebra: Intergers and Operations, Fractions: The 4 Basic Mathematical Functions, Ratios & Proportions, Perimeter, Volume and Thinking Graphically.

http://www.leeric.lsu.edu/bgbb/7/ecep/math/math.htm