I'm reasonably good at maths. Not scientist-level or anything, but my algebra is pretty solid, and my trigonometry is passable. I solve most everyday arithmetic problems without really thinking about it, the answers (or a very good estimate) are just in my head before i have time to think about what the question was.

Derivation and integration is where i started to run into problems, but it was probably because of the pace of which the classes moved, than the actual logic behind it.

I used to live with someone who was very bad at maths. I think she had dyscalculia. She would need to use a calculator to multiply 4 and 3 when adjusting food recipes and things like that. It was really hard for me to understand how hard it was for her, when things that was almost as basic as reading didn't come easy to her. I could tell that it made her life difficult.