Solution: The LCM of 142 and 145 is 20590
Methods
How to find the LCM of 142 and 145 using Prime Factorization
One way to find the LCM of 142 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 142?
What are the Factors of 145?
Here is the prime factorization of 142:
2
1
×
7
1
1
2^1 × 71^1
2 1 × 7 1 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: 2, 71, 5, 29
2
1
×
5
1
×
2
9
1
×
7
1
1
=
20590
2^1 × 5^1 × 29^1 × 71^1 = 20590
2 1 × 5 1 × 2 9 1 × 7 1 1 = 20590
Through this we see that the LCM of 142 and 145 is 20590.
How to Find the LCM of 142 and 145 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 142 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, 142 and 145:
What are the Multiples of 142?
What are the Multiples of 145?
Let’s take a look at the first 10 multiples for each of these numbers, 142 and 145:
First 10 Multiples of 142: 142, 284, 426, 568, 710, 852, 994, 1136, 1278, 1420
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 142 and 145 are 20590, 41180, 61770. Because 20590 is the smallest, it is the least common multiple.
The LCM of 142 and 145 is 20590.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 92 and 42?
What is the LCM of 64 and 115?
What is the LCM of 101 and 36?
What is the LCM of 150 and 32?
What is the LCM of 30 and 45?