How to be a human calculator

[SeventhSandwich]

http://www.glad2teach.co.uk/

This guy is loving amazing.

He calculates in like 5 seconds.

He has some more videos on his youtube profile so you should check them out.

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[TeslaCoil]

Cool Sahib

[Unwritten Calender]

holy shat
i'm going to use this in school

[CopBlock]

i feel dumb now :(