A question for anyone with experience with MathAcademy: how does it handle proofs for the ideas it teaches? If my aim is to understand the mathematics, not just to solve equations, is this the right kind of tool?

My biggest complaint about the maths I've learned in the UK is that it was always taught mechanically. e.g. matrices were just taught as a set of rules for which numbers to add/multiply etc to get the right result, with no mention of why it all worked or the proofs behind it.