It's neat and clean and gets the point across. Looks fine to me. About how many subjects have you done pages for like this so I can update wiki.
In mathematics, you don't understand things. You just get used to them.
I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.
Heaps! I am aiming to cover all of Algebra up to University Entrance level. That should take me some time.
No need to update wiki, just let people go to the website and use search.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman