How to find the Least Common Multiple of 10 and 18?
On this page below, we'll use the Prime Factorisation, and the List of Multiples method to find out the LCM of 10 and 18.
Follow the steps below, and let's calculate the LCM of 10 and 18.
Method 1 - Prime factorization
Step 1: Create a list of all the prime factors of the numbers 10 and 18:
Prime factors of 10
The prime factors of 10 are 2 and 5. Prime factorization of 10 in exponential form is:
10 = 21x51
Prime factors of 18
The prime factors of 18 are 2, 3 and 3. Prime factorization of 18 in exponential form is:
18 = 21x32
Step 2: Identify the highest power of each prime number from the above boxes:
21, 51, 32
Step 3: Multiply these values together:
21x51x32=90
Step 4: The result:
As seen on the calculation above, we have now obtained the LCM of 10 and 18.
The Least Common Multiple of 10 and 18 is 90.
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 10:
10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120
Multiples of 18:
18, 36, 54, 72, 90, 108, 126, 144
Therefore,
LCM(10, 18) = 90