Q:

What is the LCM of 28 and 131?

Accepted Solution

A:
Solution: The LCM of 28 and 131 is 3668 Methods How to find the LCM of 28 and 131 using Prime Factorization One way to find the LCM of 28 and 131 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 28? What are the Factors of 131? Here is the prime factorization of 28: 2 2 × 7 1 2^2 × 7^1 2 2 × 7 1 And this is the prime factorization of 131: 13 1 1 131^1 13 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, 7, 131 2 2 × 7 1 × 13 1 1 = 3668 2^2 × 7^1 × 131^1 = 3668 2 2 × 7 1 × 13 1 1 = 3668 Through this we see that the LCM of 28 and 131 is 3668. How to Find the LCM of 28 and 131 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 28 and 131 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, 28 and 131: What are the Multiples of 28? What are the Multiples of 131? Let’s take a look at the first 10 multiples for each of these numbers, 28 and 131: First 10 Multiples of 28: 28, 56, 84, 112, 140, 168, 196, 224, 252, 280 First 10 Multiples of 131: 131, 262, 393, 524, 655, 786, 917, 1048, 1179, 1310 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 28 and 131 are 3668, 7336, 11004. Because 3668 is the smallest, it is the least common multiple. The LCM of 28 and 131 is 3668. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 77 and 112? What is the LCM of 9 and 94? What is the LCM of 95 and 13? What is the LCM of 99 and 146? What is the LCM of 91 and 127?