| Divisibility by 9 |
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How to determine is if a number is divisible by 9 without performing the actual division.
Rule: A number is divisble by 9 only if the sum of the individual digits of the number is also evenly divisible by 9. Example: The number 504 is divisible by 9 because the sum of the digits i.e. (5+0+4) = 9 is also divisible by 9. |
