![]() ![]() ![]() ![]() Maybe it would take 10 minutes for the video, 15 problems for each skill, and 1 minutes per problem in Algebra - but it's going to slow down a lot as you get to Trigonometry and Calculus. If you're a brilliant elementary student who has just finished all the K-8 work but hasn't learned anything more yet, then you'll need to watch videos for each topic and work on the exercises. Averaging two questions per topic and taking one minute per question, that's 780 minutes and you're done in 13 hours. If you're a fantastic math PhD, then it's just a matter of answering one or two questions for each one (I think Khan gives you more credit towards mastery the faster you answer questions, at least at first). So let's assume we're talking about the remaining 390 exercises, Algebra through Integral Calculus. Right now (Jan 1, 2015), there are 926 math exercises on Khan and 536 of them are for grades K-8. ![]()
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