5/26/2023 0 Comments Khan academy math 1Averaging 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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