Solution: The LCM of 109 and 87 is 9483
Methods
How to find the LCM of 109 and 87 using Prime Factorization
One way to find the LCM of 109 and 87 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 109?
What are the Factors of 87?
Here is the prime factorization of 109:
10
9
1
109^1
10 9 1
And this is the prime factorization of 87:
3
1
×
2
9
1
3^1 × 29^1
3 1 × 2 9 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: 109, 3, 29
3
1
×
2
9
1
×
10
9
1
=
9483
3^1 × 29^1 × 109^1 = 9483
3 1 × 2 9 1 × 10 9 1 = 9483
Through this we see that the LCM of 109 and 87 is 9483.
How to Find the LCM of 109 and 87 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 109 and 87 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, 109 and 87:
What are the Multiples of 109?
What are the Multiples of 87?
Let’s take a look at the first 10 multiples for each of these numbers, 109 and 87:
First 10 Multiples of 109: 109, 218, 327, 436, 545, 654, 763, 872, 981, 1090
First 10 Multiples of 87: 87, 174, 261, 348, 435, 522, 609, 696, 783, 870
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 109 and 87 are 9483, 18966, 28449. Because 9483 is the smallest, it is the least common multiple.
The LCM of 109 and 87 is 9483.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 60 and 114?
What is the LCM of 147 and 81?
What is the LCM of 12 and 120?
What is the LCM of 74 and 135?
What is the LCM of 132 and 4?