1 and 3
The Greatest Common Factor of 15, 21, 28: 1
The GCF is 3.
It is: 1
1
The factors of 15 are 3 and 5. The factors of 21 are 3 and 7. So the common factor is 3.
The least common factor of any set of numbers is 1.
The GCF is 3.
The GCF is 3.
The greatest common factor of 15 and 21 is 3The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The GCF is 1.
The GCF is 3.
The GCF is 1.