Solution: The LCM of 66 and 129 is 2838
Methods
How to find the LCM of 66 and 129 using Prime Factorization
One way to find the LCM of 66 and 129 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 66?
What are the Factors of 129?
Here is the prime factorization of 66:
2
1
×
3
1
×
1
1
1
2^1 × 3^1 × 11^1
2 1 × 3 1 × 1 1 1
And this is the prime factorization of 129:
3
1
×
4
3
1
3^1 × 43^1
3 1 × 4 3 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: 2, 3, 11, 43
2
1
×
3
1
×
1
1
1
×
4
3
1
=
2838
2^1 × 3^1 × 11^1 × 43^1 = 2838
2 1 × 3 1 × 1 1 1 × 4 3 1 = 2838
Through this we see that the LCM of 66 and 129 is 2838.
How to Find the LCM of 66 and 129 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 66 and 129 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, 66 and 129:
What are the Multiples of 66?
What are the Multiples of 129?
Let’s take a look at the first 10 multiples for each of these numbers, 66 and 129:
First 10 Multiples of 66: 66, 132, 198, 264, 330, 396, 462, 528, 594, 660
First 10 Multiples of 129: 129, 258, 387, 516, 645, 774, 903, 1032, 1161, 1290
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 66 and 129 are 2838, 5676, 8514. Because 2838 is the smallest, it is the least common multiple.
The LCM of 66 and 129 is 2838.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 57 and 31?
What is the LCM of 7 and 77?
What is the LCM of 39 and 124?
What is the LCM of 8 and 133?
What is the LCM of 14 and 30?