How to find the Least Common Multiple of 4 and 15?
On this page below, we'll use the Prime Factorisation, and the List of Multiples method to find out the LCM of 4 and 15.
Follow the steps below, and let's calculate the LCM of 4 and 15.
Method 1 - Prime factorization
Step 1: Create a list of all the prime factors of the numbers 4 and 15:
Prime factors of 4
The prime factors of 4 are 2 and 2. Prime factorization of 4 in exponential form is:
4 = 22
Prime factors of 15
The prime factors of 15 are 3 and 5. Prime factorization of 15 in exponential form is:
15 = 31x51
Step 2: Identify the highest power of each prime number from the above boxes:
22, 31, 51
Step 3: Multiply these values together:
22x31x51=60
Step 4: The result:
As seen on the calculation above, we have now obtained the LCM of 4 and 15.
The Least Common Multiple of 4 and 15 is 60.
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 4:
4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72
Multiples of 15:
15, 30, 45, 60, 75, 90, 105
Therefore,
LCM(4, 15) = 60