Japanese Multiplication Trick

The math geek in me loves this!  I’ve been seeing it go around Facebook quite a bit and had to try it out with small numbers and big numbers.  It totally works.  Now I don’t know if it’s necessarily faster than doing it my old way but it sure is interesting.

Click on the picture to see a bigger version if this one is too small.

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Do you see what I did there? Count where the lines intersect and you get your final number.  Go left to right (you’ll find out why in the next picture).

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You go from left to right and “carry” the tens if needed.

Cool, huh?

Still don’t get it?  Check out this video on youtube.com.  They even show how to do triple digit numbers.

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