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

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All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.

Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.

All numbers divisible by 9 are divisible by 3; since 9 = 3 x 3 all multiples of 9 are also multiples of 3. However, all numbers divisible by 3 are not divisible by 9, eg 6 = 2 x 3 but 6 is not divisible by 9 (since 6 is not a multiple of 9) - it only takes one counter example to disprove a theory.

Yes.

Yes, if you are referring to whole numbers.

Yes; all numbers that are divisible by 9 are divisible by 3.

yEAH, i THINK SO

Talking in Integers only, then no. Example, 3 is not divisible by 6. Talking all natural numbers... then yes. 3 / 6 = 0.5

Because 9 is divisible by 3, this is like the rule where if a number is divisible by 2 and 3 it is also divisible by 6.

because 6 is also divisiable by 3... just alike all numbers that are divisable by 162 are divisable by 6 AND 3

yes because 3 fits in 9 perfectly

No, just every third one.

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