For me learning math wasn't too difficult, I always had an affinity for it. However, I realized that a good story of how many apples and oranges can be bought with any collection of coins was always a lot more fun than some random numbers strewn across the page.
The current scenario is, however, not so. Most systems are still held bent on using the old hammer and nail system to pound all the theories into those little heads.
Kids don't care about theorems, that's why all the greek dudes were old.
An example:
http://hpmor.com/
Look at the latest authors notes (ch 85)