The lowest/least common multiple (abbreviated to LCM) is the lowest number that is a multiple of two or more subject-numbers. For example, the common multiples of 4 and 5 are 20, 40, 60, 80 and so on.

Nod your head in a yes in case you were the type who did not like LCM and HCF in school. Nod your head again if you never or just rarely got correct answers in calculating LCM and HCF. Well, whatever ...

Refresh your knowledge with these guides on factor trees and writing numbers as a product of prime factors. List the factors of each number. Compare the lists to find the greatest number common to ...