15 , 18

Find the common factors for the numerical part:

15,18

The factors for 15 are all numbers between 1 and 15, which divide 15 evenly.

Check numbers between 1 and 15

Find the factor pairs of 15 where x⋅y=15.

xy11535

List the factors for 15.

1,3,5,15

1,3,5,15

The factors for 18 are all numbers between 1 and 18, which divide 18 evenly.

Check numbers between 1 and 18

Find the factor pairs of 18 where x⋅y=18.

xy1182936

List the factors for 18.

1,2,3,6,9,18

1,2,3,6,9,18

List all the factors for 15,18 to find the common factors.

15: 1,3,5,15

18: 1,2,3,6,9,18

The common factors for 15,18 are 1,3.

1,3

The GCF (HCF) of the numerical factors 1,3 is 3.

3

Find the GCF 15 , 18