Multiplication Tricks
Before we get into the videos of amazing math tricks. I highly recommend the book Secrets of Mental Math by Arthur Benjamin and Michael Shermer:
On to the videos! Here's a cool finger multiplication trick by the amazing teachertipster. This guy is great!
Another fun way to multiply by 9
Here's one for multiplying 2-digit numbers (video by techmath):
How to multiply large numbers by eleven in your head (video by mathtutordvd):
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