We use prime factorization, that's writing a number as a product of its prime factors, to find two (or more) numbers' Highest Common Factor (HCF) and Least Common Multiple (LCM).
This is very useful when trying to find the HCF, or LCM, of large numbers.
In the following tutorial we review the method for finding two numbers' least common multiple using prime factorization.
Leaving your answers as products of prime factors, find the Highest Common Factor, HCF, and the Least Common Multiple, LCM, of each of the following pairs of whole numbers: