Solution: The LCM of 145 and 71 is 10295
Methods
How to find the LCM of 145 and 71 using Prime Factorization
One way to find the LCM of 145 and 71 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 145?
What are the Factors of 71?
Here is the prime factorization of 145:
5
1
×
2
9
1
5^1 × 29^1
5 1 × 2 9 1
And this is the prime factorization of 71:
7
1
1
71^1
7 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: 5, 29, 71
5
1
×
2
9
1
×
7
1
1
=
10295
5^1 × 29^1 × 71^1 = 10295
5 1 × 2 9 1 × 7 1 1 = 10295
Through this we see that the LCM of 145 and 71 is 10295.
How to Find the LCM of 145 and 71 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 145 and 71 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, 145 and 71:
What are the Multiples of 145?
What are the Multiples of 71?
Let’s take a look at the first 10 multiples for each of these numbers, 145 and 71:
First 10 Multiples of 145: 145, 290, 435, 580, 725, 870, 1015, 1160, 1305, 1450
First 10 Multiples of 71: 71, 142, 213, 284, 355, 426, 497, 568, 639, 710
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 145 and 71 are 10295, 20590, 30885. Because 10295 is the smallest, it is the least common multiple.
The LCM of 145 and 71 is 10295.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 8 and 61?
What is the LCM of 70 and 54?
What is the LCM of 66 and 73?
What is the LCM of 50 and 31?
What is the LCM of 118 and 11?