LCM stands for Least Common Multiple. In mathematics, the least common multiple of two or more numbers is the smallest positive integer that is a multiple of each of the numbers. <span style="font-family: Arial; font-size: 10pt;">What is LCM in Maths with Example </span>In simple terms, it is the smallest number that all the given numbers can divide into without leaving a remainder.For example, if you are working with 4 and 5, the smallest number that both 4 and 5 divide into evenly is 20. Therefore, the LCM of 4 and 5 is 20.