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Almost the same rule and dividing by 3. Add up all the digits in the number. Find out what the sum is. If the sum is divisible by 9, so is the number.

For example: 43785 (4+3+7+8+5=27) 27 is divisible by 9, therefore 43785 is too!

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Q: Describe a method for determining weather a number is divisible by 9?
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