How to find the Least Common Multiple of 18 and 27?
On this page below, we'll use the Prime Factorisation, and the List of Multiples method to find out the LCM of 18 and 27.
Follow the steps below, and let's calculate the LCM of 18 and 27.
Method 1 - Prime factorization
Step 1: Create a list of all the prime factors of the numbers 18 and 27:
Prime factors of 18
The prime factors of 18 are 2, 3 and 3. Prime factorization of 18 in exponential form is:
18 = 21x32
Prime factors of 27
The prime factors of 27 are 3, 3 and 3. Prime factorization of 27 in exponential form is:
27 = 33
Step 2: Identify the highest power of each prime number from the above boxes:
21, 33
Step 3: Multiply these values together:
21x33=54
Step 4: The result:
As seen on the calculation above, we have now obtained the LCM of 18 and 27.
The Least Common Multiple of 18 and 27 is 54.
Method 2 - List of Multiples
Find and list multiples of each number until the first common multiple is found. This is the lowest common multiple.
Multiples of 18:
18, 36, 54, 72, 90, 108
Multiples of 27:
27, 54, 81, 108, 135
Therefore,
LCM(18, 27) = 54