Question

What is divisibility test of 7?​

Answer 1

First, multiply the rightmost (unit) digit by 2, and then subtract the product from the remaining digits. If the difference is divisible by 7, then the number is divisible by 7. ... We take the difference as the new number, we multiply the rightmost digit by 2, and then subtract from the remaining digits.

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Answer 2

To determine if a number is divisible by 7, take the last digit off the number, double it and subtract the doubled number from the remaining number. If the result is evenly divisible by 7 (e.g. 14, 7, 0, -7, etc.), then the number is divisible by seven. This may need to be repeated several times.