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I'm having similar thoughts. I've started this journey by trying to complete all exercises on khanacademy.org.

Same, I started at the pre-school math lessons and worked forward from there.

Progress is sporadic, due to having a newborn in the house, but patching all the holes in my math knowledge feels good.

Likewise. I started with pre-algebra level stuff and I just login when I have some free time and watch more videos and do more exercises. I figure every time I jump on there and do some of it, I'm improving that foundation.

I've also been running through the series of Youtube videos on Calculus I by Professor Leonard. The plan is to go through his entire sequence (Calc I, II and III) and then move on to Linear Algebra (I've already been dabbling in that as well, mostly with the 3blue1brown videos).

It's not easy, but I think it's worth the effort to build up that math base. It increases the scope of things you can read, study and understand, which is pretty valuable.

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