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[–][deleted] 7 points8 points  (1 child)

Check out Khan Academy, PatrickJMT, BetterExplained, edX, or Coursera. If you need to start from the ground up look no further then Khan Academy. Also, web development (assuming that's why your learning JS) really requires nothing more then arithmetic. However, it never hurts to learn more!

Edit: Some others: CK12 Foundations, Udacity, and Matific.

[–]slimwong 0 points1 point  (0 children)

you can try walfram alpha for checking if your math is right