The gcf (greatest common factor) or gcd (greatest common divisor) or hcf (highest common factor) of 6 and 9 is equal to 3.

For finding the gcf of 6 and 9 you can enumerate all the factors or divisors of 6 and 9 and you have to choose the greatest common factor among the common factors of the two numbers:

List of the divisors of 6: 1; 2; 3; 6

List of the divisors of 9: 1; 3; 9

6 has 4 factors and 9 has 3 factors, 6 and 9 have 2 common factors : 1 and 3, the greatest factor among 1 and 3 is 3 that's why the gcf of 6 and 9 is equal to 3.

The gcf of some couples of integers:

### GCF of 9 and 12:

**The gcf of 9 and 12 is 3 **

### GCF of 9 and 15:

**The gcf of 9 and 15 is 3 **

### GCF of 9 and 18:

**The gcf of 9 and 18 is 9 **

### GCF of 9 and 21:

**The gcf of 9 and 21 is 3 **

### GCF of 9 and 24:

**The gcf of 9 and 24 is 3 **

### GCF of 6 and 4:

**The gcf of 6 and 4 is 2**

### GCF of 6 and 8:

**The gcf of 6 and 8 is 2**

### GCF of 6 and 10:

**The gcf of 6 and 10 is 2**

### GCF of 6 and 12:

**The gcf of 6 and 12 is 6**

### GCF of 6 and 15:

**The gcf of 6 and 15 is 3**

### GCF of 6 and 18:

**The gcf of 6 and 18 is 6**

### GCF of 6 and 20:

**The gcf of 6 and 20 is 2 **

### GCF of 6 and 21:

**The gcf of 6 and 21 is 3 **

### GCF of 6 and 30:

**The gcf of 6 and 30 is 6 **

For finding the gcf of 6 and 9 you can enumerate all the factors or divisors of 6 and 9 and you have to choose the greatest common factor among the common factors of the two numbers:

List of the divisors of 6: 1; 2; 3; 6

List of the divisors of 9: 1; 3; 9

6 has 4 factors and 9 has 3 factors, 6 and 9 have 2 common factors : 1 and 3, the greatest factor among 1 and 3 is 3 that's why the gcf of 6 and 9 is equal to 3.

The gcf of some couples of integers: