Question

what is the divisibility test by 7 ?​

Answer 1

Answer:

It is to see if 7 is divisible by a  number if you meant how then divisibility of 7 is :-

The divisibility rule of 7 states that for a number to be divisible by 7, the last digit of the given number should be multiplied by 2 and then subtracted with the rest of the number leaving the last digit. If the difference is 0 or a multiple of 7, then it is divisible by 7.

Answer 2

Divisibility by 7:

Remove the last digit, double it, subtract it from the remaining number and continue doing this until 0 or a multiple of 7 is remained.

Examples:

1. Check if 67606 is divisible by 7 by the divisibility test:

67606 = 6760 - (2x6) = 6760 - 12 = 6748

6748 = 674 - (2x8) = 674 - 16 = 658

658 = 65 - (2x8) = 65 - 16 = 49

Since, 49 is a multiple of 7(7*7), so 67606 is divisible by 7.