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Is Khan Academy's practice good enough to learn math?

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Khan is something like Duolingo. If you are scared of it and need to get comfortable, it's great. To learn seriously, you need something like a textbook with official reference points (defs, theorems, etc). If you seriously need that much practice for a given concept, then you're not learning it to begin with and need to focus on algebra fundamentals. That said, the examples in Khan often lack depth, so you won't necessarily see all the situations that illustrate the topic.
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Khan is a GREAT resource for most everything under the sun.

If you spend a half you going through YouTube math channels, you'll quickly fine one or two that will resonate with you.

All free. And you can pick your teaching style.
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Beginnings of algebra and anything under, absolutely. Higher stuff it's still good, but you'll probably want to reference some other resources to really comprehend what's happening.
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It's a good start. For daily practice I much prefer Alcumus from AOPS as it has better problems. For learning a textbook is probably best but YouTube has a ton of great in depth content now also.
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I self studied BC as a sophomore, what I found worked was using khan for practice problems and structure, and using the Petersons textbook for explanation etc. IXL is helpful for review up to differentiation but breaks down aft that
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Yes. Paul's Online Notes and Mathisfun are both good too.
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I used khan to relearn most of highschool algebra. I am now in college and going through algebra again to upgrade my courses. I found that khan academy got me about 80% of the way there. But it definitely misses the mark a little bit when it comes to hard problems. I am learning the same stuff in college but the problems we are doing are much more advanced.

So if you want to relearn I would use his videos in addition to a textbook/workbook with additional problems.
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Check out cemc courseware (uwaterloo)

They have lessons and practice problems that randomly generate :) and solutions to many practice problems too
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Get a textbook and work tons of exercises.

This is the way.

For many calculus problems, the answer, for checking, can be gotten by using free online calculators, e.g. Wolfram|Alpha or Symbolab.

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