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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.

hope i helped u:)

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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 .

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 .