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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.

Q: Are all numbers that are divisible by 9 also divisible by 3 are all numbers that are divisible by 3 also divisible by 9 how do you know?

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All numbers that are divisible by 8 and 12 would also be divisible by 4.

Two. All numbers are also divisible by 1.

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.

no

-- All of the numbers that end with a zero are divisible by 10.-- All of those, and all of the numbers that end with a 5, are also divisible by 5.

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All numbers that are divisible by 8 and 12 would also be divisible by 4.

Two. All numbers are also divisible by 1.

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.

All numbers are divisible by one.

no

No, because 1 is not evenly divisible by 5. However, all numbers divisible by 5 are divisible by 1.

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

Yes, if you are referring to whole numbers.

No. 15 is divisible by 5.

Yes.

Yes.

-- All of the numbers that end with a zero are divisible by 10.-- All of those, and all of the numbers that end with a 5, are also divisible by 5.