When adding or subtracting unlike fractions, the LCM process is used to find the least common denominator.
you use the lcm (least common multiple).
Gcf you use when you are finding the greatest factor for the numbers. Lcm you use when you are finding the smallest multiple in the numbers factors
LCM of 96 and 45 is 1440.
You can, but there are more efficient ways to find the LCM.
The LCM of 8 and 108 is 216, no matter what you use.
We use the LCM to find the least common denominator of unlike fractions.
To find the GCF and the LCM you have to first at least try to use prime factorization. So use factor trees. Or for the LCM find th least common multiples of the number.
a and b have no common prime factors. Their LCM is their product.
The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.
You would use it when adding fractions.
It doesn't matter which method you use. You still need at least two numbers to find an LCM. There is no LCM of 20.
You need at least two numbers to find an LCM no matter what you use.