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Not sure if this is the place for it, but there are similar posts for podcasts and blogs, so I'll post this one. I'd be interested in seeing a list of online resources for mathematics learning.

As someone doing a non-maths degree in college I'd be interested in finding some resources for learning more maths online, most resources I know of tend to either assume a working knowledge of maths beyond secondary school level, or only provide a brief summary of the topic at hand.

I'll start off by posting MIT Open Courseware, which is a large collection of lecture notes, assignments and multimedia for the MIT mathematics courses, although in many places it's quite incomplete.

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  • $\begingroup$ Mathematics Educators is another place to ask. They're happy to have questions about learning, not just teaching. (I think they might also consider it too general though.) $\endgroup$ Commented Dec 11, 2018 at 17:07

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The following reddit post has a decent list of math resources:

One site I did not see it their list that I've found very helpful:

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  • Khan Academy, http://www.khanacademy.org/
  • You'll find tons of explanatory videos from various branches of mathematics; plus, each subject is explained pretty good, and the videos are easy to follow
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    $\begingroup$ Khan Academy is terrible. Try MIT's opencourseware instead. $\endgroup$ Commented Jul 21, 2010 at 10:23
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    $\begingroup$ @Harry: If this is an answer, post an answer. If you think this answer is unhelpful, downvote. Please don't use the comments to provide nonconstructive criticism. $\endgroup$ Commented Jul 21, 2010 at 18:44
  • $\begingroup$ I have seen over half of Khan Academy's math videos and done nearly all exercises. I am now studying pure mathematics at college. Khan academy's math is good for getting a basic understanding of math, or if your math skillset crumbled somewhere along your highschool education, like it did for me. But there is a huge difference between KA's math level and college math. If you're serious about learning math, and you already have a decent understanding of the basics, I'd say don't bother with Khan Academy. If you never really understood math well though, it might be a good place to start. $\endgroup$ Commented Jan 8, 2013 at 23:16
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Andrea Feretti's MathOnline page.

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A useful one for undergraduate level maths is Mathcentre. It has useful background material for people studying maths, or who need some maths background for other courses.

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  • $\begingroup$ That, and the associated mathtutor.ac.uk site, are more pre-undergraduate in UK terms, though still worthwhile $\endgroup$ Commented Nov 27, 2015 at 8:33
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Purplemath has a list for math lessons and tutoring. It's a list with various links and short reviews referring to tutoring and instructional resources.

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For basic mathematics mathpage has a long course, including the list below. Don't be put off by the elementary school style lesson names, it does go into some depth with each one.

 Lesson 1 Reading and Writing Whole Numbers Lesson 2 The Meaning of Decimals Lesson 3 Multiplying and Dividing Lesson 4 More Elementary Addition Lesson 5 Adding Whole Numbers and Decimals Lesson 6 The Meaning of Subtraction Lesson 7 Subtracting Whole Numbers and Lesson 8 The Meaning of Multiplication Lesson 9 Multiplying Whole Numbers Lesson 10 The Meaning of Division Lesson 11 Short Division Lesson 12 Dividing Decimals Lesson 13 Percent with a Calculator Lesson 14 Parts of Natural Numbers 1 Lesson 15 Parts of Natural Numbers 2 Lesson 16 Ratio and Proportion 1 Lesson 17 Ratio and Proportion 2 Lesson 18 Proportionality Lesson 19 Proper Fractions, Mixed Numbers Lesson 20 Unit Fractions Lesson 21 Equivalent Fractions Lesson 22 Lowest Common Multiple Lesson 23 Fractions into Decimals Lesson 24 Adding and Subtracting Fractions Lesson 25 Multiplying Fractions Lesson 26 The Meaning of Multiplying Fractions Lesson 27 Percents are Ratios Lesson 28 Percent of a Number Lesson 29 What Percent? Lesson 30 Percent Increase or Decrease Lesson 31 Prime Numbers Lesson 32 Greatest Common Divisor
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Two good general references:

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  • $\begingroup$ Though a lot of the Wikipedia articles assume quite advanced knowledge on the part of the reader, especially knowledge of advanced notation. $\endgroup$ Commented Dec 11, 2018 at 17:03
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J. Milne has publicized his lecture notes for free, complete with exercises in fields such as group theory, field theory, algebraic geometry, algebraic number theory, "and so on". http://www.jmilne.org/math/CourseNotes/index.html (probably best suited for upper undergrad or grad students, though)

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Paul's Online Notes seem to be very good: http://tutorial.math.lamar.edu/

They cover most basic math courses that an undergraduate would take.

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Check out http://www.redhoop.org/search/?q=math. It lists free and paid online courses on math

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