This is a big coincidence for me, a few hours ago I posted a reply to someone else saying I've decided this year to plough through khan academy at least until I can do some calculus.

I'm in the same boat as you I think.

I'm 40, work as a programmer and I have a fear of being found out for not know enough maths.

I bought "math for programmers" https://www.manning.com/books/math-for-programmers But I realised I really need to get better at algebra first.

I'm treating this as how I treated learning the guitar on my own when I was 12, sit in my room at night and practice.

I'd be interested to hear what people think of my khan academy plan :)