Beauty of Mathematics mathematics,Symmetry of...
Rated • 115 reviews • mathematics • 4to40.com
For instance: We all know that in a multiple of 9, all the digits add up to 9 a multiple of 9. But you can go farther and show that that works in ANY base. In base 5, the number 134212 is a multiple of 4 because the digits add up to 12 (a multiple of 4). The same even works for the square root of the number too, just like for the number 3 (square root of 9) in base 10.
There are so many things like this in mathematics that most classes don't even touch. I was never taught like that. Math isn't memorization. It's the search for beautiful patterns. [/rant]

