http://www.purplemath.com/ So today I promised some sights to help with math and science. I have two sights Purplemath and Khan Academy.
Purple math contains very straightforward useful lessons on Algebra and pre-algebra topics as well as trigonometry. It also contians links to worksheets and tutoring sights. My one complaint is that the help stops after you pass trigonometry, you are your own for calculus.
Khanacademy has math through the university calculus sequence as well as math puzzles and science videos. Sal Khan explains the material in videos that show the math and diagrams. There are also exercises that go from basic addition through basic differential calculus.
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