Answers

2014-06-20T13:57:56+05:30
divisibily test of 13:-Add 4 times the last digit to the rest.
for eg : let the no. be 637;
therefore by the divisibility rule of 13;
63+7*4=63+28=91
since 91 is divisible by 13(13*7=91);
HENCE THE NO. 637 DIVISIBLE BY 13.
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2014-06-20T14:04:52+05:30

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Divisibily test of 13
multiply the last digit with 4 and add with the rest number
like 273 
so multiply 4 with 3 you get 4 × 3 = 12
no add 27(this number comes from the original number) to it so add 12 with 27 
12 + 27 = 39 so 39 is a factor of 13 so it is divisible by 13 .

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