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).