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.
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