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A number is divisible by 9 if all the digits add up to 9 or are a factor of. IF the digits add up to 9 (or a factor of 9), they will automatically be a factor of 3.
Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

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Q: Are all numbers divisible by 9 divisible by 3?
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