Q:

What is the LCM of 120 and 122?

Accepted Solution

A:
Solution: The LCM of 120 and 122 is 7320 Methods How to find the LCM of 120 and 122 using Prime Factorization One way to find the LCM of 120 and 122 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 120? What are the Factors of 122? Here is the prime factorization of 120: 2 3 × 3 1 × 5 1 2^3 × 3^1 × 5^1 2 3 × 3 1 × 5 1 And this is the prime factorization of 122: 2 1 × 6 1 1 2^1 × 61^1 2 1 × 6 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, 5, 61 2 3 × 3 1 × 5 1 × 6 1 1 = 7320 2^3 × 3^1 × 5^1 × 61^1 = 7320 2 3 × 3 1 × 5 1 × 6 1 1 = 7320 Through this we see that the LCM of 120 and 122 is 7320. How to Find the LCM of 120 and 122 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 120 and 122 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, 120 and 122: What are the Multiples of 120? What are the Multiples of 122? Let’s take a look at the first 10 multiples for each of these numbers, 120 and 122: First 10 Multiples of 120: 120, 240, 360, 480, 600, 720, 840, 960, 1080, 1200 First 10 Multiples of 122: 122, 244, 366, 488, 610, 732, 854, 976, 1098, 1220 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 120 and 122 are 7320, 14640, 21960. Because 7320 is the smallest, it is the least common multiple. The LCM of 120 and 122 is 7320. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 131 and 16? What is the LCM of 133 and 89? What is the LCM of 72 and 105? What is the LCM of 68 and 98? What is the LCM of 144 and 65?