The two common factors of 6 and 9 are 1 and 3.
1
1 to 2
A common factor of 5 and 9 is 1
18
The Greatest Common Factor of 21, 9 is 3.
18
The least common factor of any set of numbers is 1.
The Common Factors of 3 and 9 are 1, 3
The LCM of 6 and 9 is 18
126
The LCM is 126.