This video is a fun example to surprise the students using the dry erase boards.  If you are a teacher, it is your responsibility to point out which step is actually not "permitted" and causes this fatal mathematical flaw!! (hint...you can't divide by zero!!)

If you are interested in more math tricks that you can show your class (or your date, ah..maybe not), there are more examples of these on YouTube.

Easy Mental Multiplication Trick

Cool Multiplication

Another graphical multiplication trick

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