We all know the rules for 2,3,4,5,6,8,9 and 10. But what is less talked about is the number 7.

Here is the shortcut to see whether the number is divisible by 7 or not.

Step1: Take a number and multiply each of the digit beginning on the right hand side by

1,3,2,6,4,5 (repeat the pattern if the number is large enough)

Step 2: Add the product of the numbers. If the sum is divisible by 7 -- so is the number.

e.g. Check for number 133

3(1) + 3(3) + 1(2) = 14 --> which is divisible by 7. So, 133 is divisible by 7.

Another example: check for no. 2016

6(1) + 1(3) + 0(2) + 2(6) = 21 --> which is also divisible by 7. So, the no. 2016 is divisible by 7.

_________________

Click on kudos, if you like my post!