Solution: The LCM of 9 and 145 is 1305
Methods
How to find the LCM of 9 and 145 using Prime Factorization
One way to find the LCM of 9 and 145 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 9?
What are the Factors of 145?
Here is the prime factorization of 9:
3
2
3^2
3 2
And this is the prime factorization of 145:
5
1
×
2
9
1
5^1 × 29^1
5 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: 3, 5, 29
3
2
×
5
1
×
2
9
1
=
1305
3^2 × 5^1 × 29^1 = 1305
3 2 × 5 1 × 2 9 1 = 1305
Through this we see that the LCM of 9 and 145 is 1305.
How to Find the LCM of 9 and 145 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 9 and 145 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, 9 and 145:
What are the Multiples of 9?
What are the Multiples of 145?
Let’s take a look at the first 10 multiples for each of these numbers, 9 and 145:
First 10 Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90
First 10 Multiples of 145: 145, 290, 435, 580, 725, 870, 1015, 1160, 1305, 1450
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 9 and 145 are 1305, 2610, 3915. Because 1305 is the smallest, it is the least common multiple.
The LCM of 9 and 145 is 1305.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 104 and 138?
What is the LCM of 52 and 46?
What is the LCM of 67 and 57?
What is the LCM of 50 and 53?
What is the LCM of 63 and 31?