Solution: The LCM of 115 and 64 is 7360
Methods
How to find the LCM of 115 and 64 using Prime Factorization
One way to find the LCM of 115 and 64 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 64?
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 64:
2
6
2^6
2 6
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
6
×
5
1
×
2
3
1
=
7360
2^6 × 5^1 × 23^1 = 7360
2 6 × 5 1 × 2 3 1 = 7360
Through this we see that the LCM of 115 and 64 is 7360.
How to Find the LCM of 115 and 64 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 115 and 64 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 64:
What are the Multiples of 115?
What are the Multiples of 64?
Let’s take a look at the first 10 multiples for each of these numbers, 115 and 64:
First 10 Multiples of 115: 115, 230, 345, 460, 575, 690, 805, 920, 1035, 1150
First 10 Multiples of 64: 64, 128, 192, 256, 320, 384, 448, 512, 576, 640
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 64 are 7360, 14720, 22080. Because 7360 is the smallest, it is the least common multiple.
The LCM of 115 and 64 is 7360.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 5 and 135?
What is the LCM of 37 and 52?
What is the LCM of 43 and 147?
What is the LCM of 57 and 63?
What is the LCM of 118 and 53?