Solution: The LCM of 115 and 32 is 3680
Methods
How to find the LCM of 115 and 32 using Prime Factorization
One way to find the LCM of 115 and 32 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 115?
What are the Factors of 32?
Here is the prime factorization of 115:
5
1
×
2
3
1
5^1 × 23^1
5 1 × 2 3 1
And this is the prime factorization of 32:
2
5
2^5
2 5
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, 23, 2
2
5
×
5
1
×
2
3
1
=
3680
2^5 × 5^1 × 23^1 = 3680
2 5 × 5 1 × 2 3 1 = 3680
Through this we see that the LCM of 115 and 32 is 3680.
How to Find the LCM of 115 and 32 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 115 and 32 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, 115 and 32:
What are the Multiples of 115?
What are the Multiples of 32?
Let’s take a look at the first 10 multiples for each of these numbers, 115 and 32:
First 10 Multiples of 115: 115, 230, 345, 460, 575, 690, 805, 920, 1035, 1150
First 10 Multiples of 32: 32, 64, 96, 128, 160, 192, 224, 256, 288, 320
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 115 and 32 are 3680, 7360, 11040. Because 3680 is the smallest, it is the least common multiple.
The LCM of 115 and 32 is 3680.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 7 and 14?
What is the LCM of 132 and 23?
What is the LCM of 50 and 44?
What is the LCM of 103 and 22?
What is the LCM of 126 and 79?