Solution: The LCM of 24 and 77 is 1848
Methods
How to find the LCM of 24 and 77 using Prime Factorization
One way to find the LCM of 24 and 77 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 24?
What are the Factors of 77?
Here is the prime factorization of 24:
2
3
×
3
1
2^3 × 3^1
2 3 × 3 1
And this is the prime factorization of 77:
7
1
×
1
1
1
7^1 × 11^1
7 1 × 1 1 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, 7, 11
2
3
×
3
1
×
7
1
×
1
1
1
=
1848
2^3 × 3^1 × 7^1 × 11^1 = 1848
2 3 × 3 1 × 7 1 × 1 1 1 = 1848
Through this we see that the LCM of 24 and 77 is 1848.
How to Find the LCM of 24 and 77 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 24 and 77 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, 24 and 77:
What are the Multiples of 24?
What are the Multiples of 77?
Let’s take a look at the first 10 multiples for each of these numbers, 24 and 77:
First 10 Multiples of 24: 24, 48, 72, 96, 120, 144, 168, 192, 216, 240
First 10 Multiples of 77: 77, 154, 231, 308, 385, 462, 539, 616, 693, 770
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 24 and 77 are 1848, 3696, 5544. Because 1848 is the smallest, it is the least common multiple.
The LCM of 24 and 77 is 1848.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 147 and 110?
What is the LCM of 52 and 93?
What is the LCM of 128 and 139?
What is the LCM of 66 and 149?
What is the LCM of 91 and 1?