What is the LCM of 18 and 42?
LCM(18,42) or the least common multiple of 18 and 42 is the least number which is exactly divisible by 18 and 42.
Answer: LCM of 18 and 42 is 126
Definition: The least common multiple, or in short denoted as LCM, is the smallest number in which the given numbers divide exactly.
Methods to Find the LCM of 18 and 42
Let us use the following methods to find the LCM of 18 and 42
Find LCM of 18 and 42 by Listing Method
In the listing method, we list the first few multiples of 18 and 42 and identify the common multiples. The least among the common multiples is the LCM of 18 and 42
Find LCM of 18 and 42 by Common Division Method
In this common division, we divide the given numbers simultaneously with prime numbers and stop the process when we don't have a prime number to divide the given numbers.
The LCM of any given set of numbers is unique and it is not based on the procedure we follow to find the LCM.