Solving (Math) Problems

Over the weekend Anthony and I tried to figure out why his latest Math test results didn't match his grasp of Mathematics (nice way to say: he did badly and had a lot of "slips of the pen"). He loves to jump right into the calculation skipping the "Due diligence" part. So we came up with a mind map to outline the steps he needs to take. It turns out, that this map serves as a general guideline to problem solving (admitting high level). Here you go:

Update: Forgot one rule (thanks to Steve Pridemore): Don't do mental math at 1am