Khan Academy is one of the greatest resources on the Internet offering free tutorials on a wide range of subjects for young and old alike.
If you are a student needing help with math, science, economics and finance than Khan Academy is just what you needed. Khan Academy offers a wide range of tutorials that most benefit young students from kindergarten through high school. The tutorials are all free and I urge you to tell a friend or family member with young children all about Khan Academy.
Even adults can find great information at Khan Academy as well.
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Sample Video: Adding and subtracting fractions | Fractions | Pre-Algebra | Khan Academy