What is the lcf of 12 and 15?

Answer 1

In order to find the LCM, you first split the two numbers into their factors:

15 is 5x3

12 is 3x2x2

Then you ignore any duplicate factors. In this case 3 is a factor of both, so we only need to count 3 once. We're left with 5,3,2 and 2.

Multiply all these numbers together to get the LCM of 15 and 12:

5x3x2x2=60

Answer 2

The least common factor of any set of integers is 1.