Question

Which number is a factor of 15, but not a multiple of 3

Answer 1

1x15=15 there is nothing else

Answer 2

We know that factors are numbers we can multiply together to get another number.

`(1)(15) = 15`

So 1 and 15 are factors of 15.

Also,
`(3)(5) = 15`

So 3 and 5 are factors of 15.

We have got 1, 3, 5, 15 all are factors of 15.

Multiple is a number that can be divided by another number without a remainder.

So we know that 3 is a multiple of 3, as
`(1)(3) = 3` and also 15 is a multiple of 3, as
`(3)(5) = 15`.

But 1 and 5 are not multiples of 3.

We have got the required answer.

1 and 5 are factors of 15 but not multiples of 3.