Q:

What is the LCM of 100 and 9?

Accepted Solution

A:
Solution: The LCM of 100 and 9 is 900 Methods How to find the LCM of 100 and 9 using Prime Factorization One way to find the LCM of 100 and 9 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 100? What are the Factors of 9? Here is the prime factorization of 100: 2 2 × 5 2 2^2 × 5^2 2 2 × 5 2 And this is the prime factorization of 9: 3 2 3^2 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, 5, 3 2 2 × 3 2 × 5 2 = 900 2^2 × 3^2 × 5^2 = 900 2 2 × 3 2 × 5 2 = 900 Through this we see that the LCM of 100 and 9 is 900. How to Find the LCM of 100 and 9 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 100 and 9 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, 100 and 9: What are the Multiples of 100? What are the Multiples of 9? Let’s take a look at the first 10 multiples for each of these numbers, 100 and 9: First 10 Multiples of 100: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 First 10 Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 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 100 and 9 are 900, 1800, 2700. Because 900 is the smallest, it is the least common multiple. The LCM of 100 and 9 is 900. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 22 and 4? What is the LCM of 5 and 104? What is the LCM of 79 and 146? What is the LCM of 3 and 50? What is the LCM of 47 and 124?