LCM stands for Least Common Multiple. LCM of two numbers say a and b is defined as the smallest positive integer divisible by both the numbers a and b. Hence, the LCM is the smallest common multiple of two or more numbers. It is also called the lowest common multiple, or smallest common multiple. The LCM of two or more numbers is defined as the smallest number that can be divided by all of the numbers . LCM is the least number that is a common multiple of all the given numbers. In Mathematics, the LCM of any two is the value that is evenly divisible by the two given numbers. The full form of LCM is Least Common Multiple . It is also called the Least Common Divisor (LCD). For example, LCM (4, 5) = 20. Here, the LCM 20 is divisible by both 4 and 5 such that 4 and 5 are called the divisors of 20. LCM is also used to add or subtract any two fractions when the denominators of the fractions are different. While performing any arithmetic operations such as addition ... The Least Common Multiple ( LCM ) of two numbers is the smallest positive number that is evenly divisible by both of them. For example, the LCM of 4 and 6 is 12, as 12 is the smallest number that is divisible by both 4 and 6.