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Q: What number is a factor of 18 but not a multiple of 3?

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No, 18 is a multiple of 3. 3 is a factor of 18.

18 6*3 = 18 54/18 = 3

18

There are two: 18 is a multiple of 3. 3 is a factor of 18.

Any multiple of 3 has 3 for a factor. So, 3, 6, 9, 12, 15, 18 and on to infinity.

3 is the smallest number that is a factor 66 and a multiple of 3

Yes, since 3 is a factor of 18, 3 will also be a factor of any multiple of 18.

Which number is a factor of 10 , but not a multiple of 5

3, 6, 9, 12, 18, 36

A factor is what goes into a number, a multiple is what a number goes into. 3 is a factor of 9 27 is a multiple of 9.

A factor of any number is a multiple of that number as for example 3 is a factor of 24 and it is also a multiple of 3 because 3*8 = 24

3, 6, 9, 18

The number 300 is a multiple of 3.The number 3 is a factor of 300.

Any number that is a multiple of 3 has 3 as a factor.

The factors of 18 are 1, 2, 3, 6, 9 and 18. None of them are multiples of 5.

Any integer multiple of 9. For example 18, or 99.

3 and 9 both work

Any multiple of 51.

3.

189 is a composite. Some quick tests, which can be done in your head: Check if the number is even (2 is a factor). Ones place will have 0,2,4,6, or 8 if even. Multiple of 5 (5 is a factor): Ones digit is 0 or 5. Multiple of 3 or 9: Add up the digits in the number; if this sum is 3 or a multiple of 3, then the original number is a multiple of 3 (3 is a factor). Additionally, if this sum equals 9 or a multiple of 9, then 9 is a factor. This is the case for 189 : 1+8+9=18, which is a multiple of 9. Since we found a factor (in addition to 1 & the original number) then the number is composite and not prime.

21 has 3 as a factor and is a multiple of 7, and so as 210, 105, and an infinite number of other numbers.

It is: 3

15

How about: 6, 9, 12 or 18

Yes.

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