Solution: The LCM of 129 and 145 is 18705
Methods
How to find the LCM of 129 and 145 using Prime Factorization
One way to find the LCM of 129 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 129?
What are the Factors of 145?
Here is the prime factorization of 129:
3
1
×
4
3
1
3^1 × 43^1
3 1 × 4 3 1
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, 43, 5, 29
3
1
×
5
1
×
2
9
1
×
4
3
1
=
18705
3^1 × 5^1 × 29^1 × 43^1 = 18705
3 1 × 5 1 × 2 9 1 × 4 3 1 = 18705
Through this we see that the LCM of 129 and 145 is 18705.
How to Find the LCM of 129 and 145 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 129 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, 129 and 145:
What are the Multiples of 129?
What are the Multiples of 145?
Let’s take a look at the first 10 multiples for each of these numbers, 129 and 145:
First 10 Multiples of 129: 129, 258, 387, 516, 645, 774, 903, 1032, 1161, 1290
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 129 and 145 are 18705, 37410, 56115. Because 18705 is the smallest, it is the least common multiple.
The LCM of 129 and 145 is 18705.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 147 and 13?
What is the LCM of 134 and 125?
What is the LCM of 84 and 55?
What is the LCM of 4 and 117?
What is the LCM of 24 and 26?