15
Which number is a factor of 10 , but not a multiple of 5
3 and 5
1 and 5
They are: 1, 3, 5 and 15
2, 3 and 5
45 = 3 * 3 * 5
As a product of its prime factors: 3*5*7 = 105
225 15 15 3 5 3 5 The factors of 225 are 3, 3, 5, and 5. A common factor is one common to each of two or more numbers. There is not greatest common factor when only one number is given.
1, 3, 5, 15
420
Any multiple of 30.
30