Does the human calculator stuff really work?

jim1174
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There are a lot of books and videos that can teach you how to do math in your head. does any of it really work.
Is there a certain book or video that you would recomend
 
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It is possible to do math in your head, therefore, yes. Doing it fast and with complicated operations requires a lot of practice and various tricks. I don't know specific books for that.
 

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