http://www.youtube.com/watch?v=8a6I-eGDKGE&feature=related
This short video shows simple tricks to tell if a number is dividable by 2,3,4,5,6,7,8,9,10!
Did you know that all numbers divisible by 3, have digits that add together to 3, 6, or 9? For example:
666315 looks like this
6+6+6+3+1+5=27 and 2+7=9!!
Therefore 666315 is divisable by 3.
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