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Give the first number :



Give the second number :

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

Multiples of 28