## Give two natural numbers and click on OK button to display their gcf and lcm

Find the multiples of an integer inside an interval of two integers

Find all the factors of a whole number

## What is the gcf of 6 and 9?

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