Prime factorization of 270: 2x3x3x3x5
So any one of these factors or combination of these factors will divide exactly into 270. Any number that is not one of these factors or a combination will not.
For example, 3x3x3x2=54 so 54 will divide exactly into 270.
270/54 = 5
4 doesn't
4 does not.
You divide them. Although you didn't quite state which number is divided by which, so there are two possible answers 270/15 = 18 15/270 = 0.05555
All numbers, except these: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270.
Since 17 is a prime number - the only two numbers that will divide into it exactly are 1 & 17 !
4 doesn't
It is any number that is not a factor of 270
4 does not.
9
You divide them. Although you didn't quite state which number is divided by which, so there are two possible answers 270/15 = 18 15/270 = 0.05555
All numbers, except these: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270.
These numbers divide evenly into 270: 1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135, 270.
Since 17 is a prime number - the only two numbers that will divide into it exactly are 1 & 17 !
3, 5, 11
The prime numbers required are 2, 3, 5 and 7
1,2,3,6,9 & 18 !
Exactly 270.