divisibility test of 7

hello friends I mathematica in this short video I am gonna show you that how a number is divisible by 7 or simply divisibility of 7. The steps of divisibility of 7 are given below:
1. multiply the one's digit number with 5
2. add the obtained number to the remaining digits of the given number
3. if the sum is divisible by 7 then it is divisible by 7 if not then the given number is not divisible by 7.

note; if the sum you obtained is very large that you can't tell that it is divisible by 7 or not then repeat at the number you obtained at the end.

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