Question

how can yoy know that a number is divisible by 7

Answer 1

How to Tell if a Number is Divisible by 7

The quick and dirty tip to test a number for divisibility by 7 is a three steps process:

Take the last digit of the number you’re testing and double it.

Subtract this number from the rest of the digits in the original number.

If this new number is either 0 or if it’s a number that’s divisible by 7, then you know that the original number is also divisible by 7. If you can’t easily tell yet if the new number is divisible by 7, go back to the first step with this new smaller number and try again.

Answer 2

Take the last digit of the number you're testing and double it. Subtract this number from the rest of the digits in the original number. If this new number is either 0 or if it's a number that's divisible by 7, then you know that the original number is also divisible by 7

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