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Arthur Benjamin does "Mathemagic" ...

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UNBELIEVABLE! I know there are certain crazy shortcuts that one can use when doing certain calculations that make them much faster, but this is way beyond anything I've seen. Wow!

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my math prof taught us how to do the day of the week thing, but i don't remember.. didn't seem worth it to remember.. but there's an easy trick to it.


and also, i've seen a lot of ways to do most of those other tricks in your head, its just hard to do them that fast. takes a lot of practice. that guy was very impressive, and also really funny. "i'm going to recap". hehe

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