Experience Summary
As a Cal Poly graduate with a BS in Computer Science, I have had to master most math and computer science course material. My experience is teaching math to mostly older teens and young adults.
In the professional world, I have trained all levels of employees on various computer systems (authoring, programming, operating systems, etc.). The training has taken the form of one-on-one, stand-up before a group, and creating online courses for "on your own" classes.
Teaching Style
I believe that most subjects are not difficult to master. Most problems come from "under learning" the subject. Repetition may work for some subjects, but with math the student needs to understand WHY a process works. Once this is learned, the rest comes rather easily.
When the student takes for granted a way to solve a problem, they are lost when the problem is presented in a different way. But, if the student understands the WHY, the presentation of the problem does not matter.