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Divisible by 9 (Math Trick)...

A number is divisible by 9 if the sum of its all digits is divisible by 9.

Let us we will apply this interesting math rule on following examples.


  • Is 333 divisible by 9?
  • The sum of its all digits is 9 which is divisible by 9, so number 333 is also divisible by 9.
    (Do this step in your mind).


  • Is 8091 divisible by 9?
  • The sum of its all digits is 18 which is divisible by 9, so number 8091 is also divisible by 9.
    (Do this step in your mind).


  • Is 78552 divisible by 9?
  • The sum of its all digits is 27 which is divisible by 9, so number 78552 is also divisible by 9.
    (Do this step in your mind).

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