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Are all numbers divisible by 9 also divisible by 3?
Yes. Test a couple numbers divisible by 9--27, 81--and they are all divisible by 3.
What counterexample to the statement all odd numbers are divisible be 3?
5, 7, a bunch of numbers that are odd are not divisible by 3. numbers that are divisible by three can have all their numbers added together and come out with a number that is divisible by 3.
Are all numbers divisible by 10 also divisible by 5?
Yes, since 10 is divisible by 5. Likewise, every number which is divisible by 9 is also divisible by 3.
Are all numbers that are divisible by 3 divisible by 6?
No.
What are numbers that are divisible by 6?
Numbers are divisible by 6 if they are divisible by both 2 and 3.All even numbers are divisible by 2. Odd numbers are not.To see if a number is divisible by 3, add the individual digits of the number to each other and see if that number is divisible by 3. If it is, then the original number is also divisible by 3.Example: 2712, add 2+7+1+2=12 Is 12 divisible by 3? Yes. Therefore, 2712 is divisible by 3.The number 2712 is also divisible by 2, since it is an even number.Now you know that 2712 is divisible by 6.
