Not sure about just typing, but working thru things for yourself helps, even if it a repetition. This is how I taught myself mathematical problem solving (and

Not sure about just typing, but working thru things for yourself helps, even if it a repetition. This is how I taught myself mathematical problem solving (and math as a side effect). I would read the problem statement, instead of looking at the solution, try to solve it for upto 15 minutes or sometimes even for several days depending on how much value I am planning to get from the solution. The Brachistochrone problem(http://en.wikipedia.org/wiki/Brachistochrone_curve http://en.wikipedia.org/wiki/Brachistochrone_curve) is an example of a problem that I tried to solve for several days. Newton solved it in 3 hours, and when you learn math like that you don't take things for granted. You can admire the amount of insight that went into the steps. You can also internalize the knowledge obtained thus exponentially more effectively than you would by listening(and falling asleep).