Mental Arithmetic

[Saint in Paradise]

Wonder how he trained himself to do this?

 

http://www.wimp.com/excitingmath/

 

 

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[Saintandy666]

Wow. Pretty incredible stuff, I wonder how long it'd take us compared to him to do that 5 digit one! Would be impossible without paper for me, but I guess that is where his words come in, to easily remember numbers.