Solution: The LCM of 18 and 83 is 1494
Methods
How to find the LCM of 18 and 83 using Prime Factorization
One way to find the LCM of 18 and 83 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 18?
What are the Factors of 83?
Here is the prime factorization of 18:
2
1
×
3
2
2^1 × 3^2
2 1 × 3 2
And this is the prime factorization of 83:
8
3
1
83^1
8 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, 83
2
1
×
3
2
×
8
3
1
=
1494
2^1 × 3^2 × 83^1 = 1494
2 1 × 3 2 × 8 3 1 = 1494
Through this we see that the LCM of 18 and 83 is 1494.
How to Find the LCM of 18 and 83 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 18 and 83 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, 18 and 83:
What are the Multiples of 18?
What are the Multiples of 83?
Let’s take a look at the first 10 multiples for each of these numbers, 18 and 83:
First 10 Multiples of 18: 18, 36, 54, 72, 90, 108, 126, 144, 162, 180
First 10 Multiples of 83: 83, 166, 249, 332, 415, 498, 581, 664, 747, 830
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 18 and 83 are 1494, 2988, 4482. Because 1494 is the smallest, it is the least common multiple.
The LCM of 18 and 83 is 1494.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 42 and 109?
What is the LCM of 138 and 124?
What is the LCM of 22 and 27?
What is the LCM of 40 and 13?
What is the LCM of 53 and 81?