With the closure of homework help, we have been handling many math related questions. Here are some useful sights:
Ask Dr. Math - This is an archive of K-12 student mathematical questions and answers. It is searchable both by a Table of Contents and by keyword.
Webmath.com - Webmath not only solves your math problems, it shows the steps taken to reach the solution. Categories include: math for everyone, general math, k-8 math, algebra, plots & geometry, trig & calculus, and other stuff.
Math Homework Helper-Fact Monster Homework Center: Math - Great math help for elementary and middle school students from Fact Monster.
The Math Page - Complete courses are available for basic arithmetic and algebra. Topics are available for trigonometry and pre-calculus.
Math2.org (Formerly Dave's Math Tables) - Contains numerous links to mathematical tables for various subjects: general math, algebra, geometry, trigonometry, calculus, and advanced topics such as fourier series and transforms. It provides formulas, diagrams and proofs which are all very useful in mathematics.
Interactive Mathematics On-line - This site takes you step by step through topics such as algebra, geometry, trigonometry, and even chaos theory and Java. There are also links to related sites.
Purplemath-Your Algebra Resource - The lessons here give pratical tips, hints, examples, and point out common mistakes. They are cross-referenced to each other, to help you find related material. Includes preliminary topics, beginning, intermediate, and advanced topics, solving word problems and an appendix.
Trigonometry Help - Basic help and tutorials for trigonometry, as well as articles about trigonometry and links to other trigonometry-related sites.
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Algebra Help - This site offers calculators and explanations to help you with basic and not so basic algebra problems.