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I've never seen this trick before, but it appears to work...   (I had to try it out an see for myself, though.)
Once you figure this out it'll blow your mind...

"The lines over the circles are color coded. Notice the single red line and 3 blue lines representing "13" grouped together while the single green and 2 black lines take their own group. [Simply] draw your first group of lines in one direction then your second group of lines going over the first, count the groups of intersections and there's your answer."


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Awesome, but it's not surprisingly fast to solve comparing to the traditional way.
Buh! I hear that they're really good at multiplication due to the abacus as well.
What is the "traditional way" +Alex Cabrera?
I learned "chisembop", and to this day I'm not sure if it was a good thing or not... 
The traditional way (possibly not the best way to call it, let's say "the way it is teached in european schools") is to learn the multiplication tables and apply them. I can't imagine mental calculation with sticks... BTW they are the same, but this graphical method maybe more difficult to extend to larger operations.
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