Solution: The LCM of 115 and 89 is 10235
Methods
How to find the LCM of 115 and 89 using Prime Factorization
One way to find the LCM of 115 and 89 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 89?
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 89:
8
9
1
89^1
8 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: 5, 23, 89
5
1
×
2
3
1
×
8
9
1
=
10235
5^1 × 23^1 × 89^1 = 10235
5 1 × 2 3 1 × 8 9 1 = 10235
Through this we see that the LCM of 115 and 89 is 10235.
How to Find the LCM of 115 and 89 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 115 and 89 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 89:
What are the Multiples of 115?
What are the Multiples of 89?
Let’s take a look at the first 10 multiples for each of these numbers, 115 and 89:
First 10 Multiples of 115: 115, 230, 345, 460, 575, 690, 805, 920, 1035, 1150
First 10 Multiples of 89: 89, 178, 267, 356, 445, 534, 623, 712, 801, 890
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 89 are 10235, 20470, 30705. Because 10235 is the smallest, it is the least common multiple.
The LCM of 115 and 89 is 10235.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 146 and 5?
What is the LCM of 98 and 78?
What is the LCM of 131 and 47?
What is the LCM of 50 and 41?
What is the LCM of 40 and 143?