http://www.youtube.com/v/sWGBcUklMBE&rel=1This video is in Malayalam (an indian language).
As u can see this boy can beat any calculator or calcultaing devices and can calculate upto 25 numbers extremely fast...before even the calculator can give results. He says its just practise. DO U HAVE ANY IDEA WHAT METHOD HE IS USING TO CALCULATE IN HIS HEAD....IS IT SIMILAR TO THE ABACUS VIDEO OF KOREAN KIDS??