Mathemagician: Just for Fun!

This video is really impressive.
He does the calculations on his head and can multiply even 5 digit numbers on the fly!
Certainly, he has mastered some tricks of numbers. It reminds me the guy who could remember x digits of pi 3.1416.... (x =500 ? I even don't remember it! ) (for me x = 5).
:)

Certainly, visualization is very stronger means of learning.


Enjoy!