Hello everyone. I have a rather unusual issue in which I do not seem to some know/understand basic concepts in prealgebra, but do rather well in something like calculus. By basic concepts, I don't mean something like solving equations, but I don't understand why certain things work the way they do. I accept that it's probably partly my fault, but at school they are too focused on teaching us "tricks" rather then showing why they work. So, can anyone recommend some resources which actually show how the fundamentals of math (mainly prealgebra) actually work? I am going through AoPS and KhanAcademy at the moment. Thanks.