Q:

What is the LCM of 112 and 72?

Accepted Solution

A:
Solution: The LCM of 112 and 72 is 1008 Methods How to find the LCM of 112 and 72 using Prime Factorization One way to find the LCM of 112 and 72 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 112? What are the Factors of 72? Here is the prime factorization of 112: 2 4 × 7 1 2^4 × 7^1 2 4 × 7 1 And this is the prime factorization of 72: 2 3 × 3 2 2^3 × 3^2 2 3 × 3 2 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, 3 2 4 × 3 2 × 7 1 = 1008 2^4 × 3^2 × 7^1 = 1008 2 4 × 3 2 × 7 1 = 1008 Through this we see that the LCM of 112 and 72 is 1008. How to Find the LCM of 112 and 72 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 112 and 72 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, 112 and 72: What are the Multiples of 112? What are the Multiples of 72? Let’s take a look at the first 10 multiples for each of these numbers, 112 and 72: First 10 Multiples of 112: 112, 224, 336, 448, 560, 672, 784, 896, 1008, 1120 First 10 Multiples of 72: 72, 144, 216, 288, 360, 432, 504, 576, 648, 720 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 112 and 72 are 1008, 2016, 3024. Because 1008 is the smallest, it is the least common multiple. The LCM of 112 and 72 is 1008. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 40 and 15? What is the LCM of 135 and 2? What is the LCM of 60 and 26? What is the LCM of 94 and 69? What is the LCM of 76 and 143?