Solution: The LCM of 55 and 103 is 5665
Methods
How to find the LCM of 55 and 103 using Prime Factorization
One way to find the LCM of 55 and 103 is to start by comparing the prime factorization of each number. To find the prime factorization, you can follow the instructions for each number here:
What are the Factors of 55?
What are the Factors of 103?
Here is the prime factorization of 55:
5
1
×
1
1
1
5^1 × 11^1
5 1 × 1 1 1
And this is the prime factorization of 103:
10
3
1
103^1
10 3 1
When you compare the prime factorization of these two numbers, you want to look for the highest power that each prime factor is raised to. In this case, there are these prime factors to consider: 5, 11, 103
5
1
×
1
1
1
×
10
3
1
=
5665
5^1 × 11^1 × 103^1 = 5665
5 1 × 1 1 1 × 10 3 1 = 5665
Through this we see that the LCM of 55 and 103 is 5665.
How to Find the LCM of 55 and 103 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 55 and 103 is to begin to list a few multiples for each number. If you need a refresher on how to find the multiples of these numbers, you can see the walkthroughs in the links below for each number.
Let’s take a look at the multiples for each of these numbers, 55 and 103:
What are the Multiples of 55?
What are the Multiples of 103?
Let’s take a look at the first 10 multiples for each of these numbers, 55 and 103:
First 10 Multiples of 55: 55, 110, 165, 220, 275, 330, 385, 440, 495, 550
First 10 Multiples of 103: 103, 206, 309, 412, 515, 618, 721, 824, 927, 1030
You can continue to list out the multiples of these numbers as long as needed to find a match. Once you do find a match, or several matches, the smallest of these matches would be the Least Common Multiple. For instance, the first matching multiple(s) of 55 and 103 are 5665, 11330, 16995. Because 5665 is the smallest, it is the least common multiple.
The LCM of 55 and 103 is 5665.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 58 and 26?
What is the LCM of 126 and 33?
What is the LCM of 133 and 54?
What is the LCM of 41 and 56?
What is the LCM of 90 and 102?