 ## How to find the Least Common Multiple of 10 and 20?

On this page below, we'll use the Prime Factorisation, and the List of Multiples method to find out the LCM of 10 and 20.

Follow the steps below, and let's calculate the LCM of 10 and 20.

### Method 1 - Prime factorization

#### Step 1: Create a list of all the prime factors of the numbers 10 and 20:

##### 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 20

The prime factors of 20 are 2, 2 and 5. Prime factorization of 20 in exponential form is:

20 = 22x51

22, 51

22x51=20

#### Step 4: The result:

As seen on the calculation above, we have now obtained the LCM of 10 and 20.

The Least Common Multiple of 10 and 20 is 20.

### 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

20, 40, 60, 80

LCM(10, 20) = 20