Revive your algebra skills at Khan Academy

American educator Salman Khan, a graduate of MIT and Harvard, started the Khan Academy in 2006 for the purpose of making “a free, world-class education available for anyone, anywhere.” Khan, a mathematician by training, features videos of an electronic blackboard on which he works out math problems while explaining them in voice-over. His site has expanded its offerings until now it not only hosts lessons in math, but also computer programming, economics and even art history. Site registration is free, and those who complete courses can earn “badges” for their accomplishments. The lessons are aimed at a college preparatory level. Still, if I had to brush up my algebra, I would click right in to Khan Academy. Khan Academy lessons are available through free apps, too.

Khan Academy
http://www.khanacademy.org

Arithmetic question? Ask Dr. Math.

Over the years, many people have written to the Math Forum at Drexel University in Philadelphia, Pennsylvania, with questions about their math homework. The Math Forum has collected these questions and answers in a searchable archive arranged by general grade level. Can’t find the answer to your question already on file? Feel free to submit your query to Dr. Math.

http://mathforum.org/dr.math/

Understand science with lectures from the Khan Academy

Watch 15 minute lectures that walk you through the basics of math, science (chemistry and biology), and some history. Brush up or learn for the first time from Salman Khan. He’s a terrific teacher!

http://www.khanacademy.org/

Look up facts and do math problems online

For answers to math questions, etc., use Wolfram Alpha

Need answers fast? Visit Wolfram|Alpha: http://www.wolframalpha.com/ . Answers factual questions like math problems and what is the capital of Vermont. There is also an iPhone app for that.