Khan Academy has delivered over 180 million lessons.
Khan Academy's mission is to provide free, world-class education to anyone, anywhere. With thousands of videos and step-by-step problems, their online materials cover subjects ranging from math and finance to history and art.
One user says, "Ever since I was young, I struggled with math, I reached a point where I would get so stressed out over having to do any sort of math problem I would shut down and cry. I avoided all math, and thought that it would always be this way. Then about a year ago, I heard about the Khan Academy. Watching the videos, being encouraged by the practice questions, boosted my confidence that I did indeed know some math. The whole site, encouraged me to keep learning, and my self-esteem has gotten way better because of my new found confidence in my growing math skills."
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