Math is really fun. We can easily find out where a number is divisible with 13 or not. What we have to do.. we have to take off the last digit and multiply it by 9. Then subtract the result from the digits you have left.If the result is 0 or dividable by 13, then the number will divide by 13.e.g.
312
Take off last digit: 2
multiply by 9 with 2: 9*2=18
subtract: 31-18=13
So, 312 is divisible by 13.
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