Q:

What is the LCM of 17 and 85?

Accepted Solution

A:
Solution: The LCM of 17 and 85 is 85 Methods How to find the LCM of 17 and 85 using Prime Factorization One way to find the LCM of 17 and 85 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 17? What are the Factors of 85? Here is the prime factorization of 17: 1 7 1 17^1 1 7 1 And this is the prime factorization of 85: 5 1 × 1 7 1 5^1 × 17^1 5 1 × 1 7 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: 17, 5 5 1 × 1 7 1 = 85 5^1 × 17^1 = 85 5 1 × 1 7 1 = 85 Through this we see that the LCM of 17 and 85 is 85. How to Find the LCM of 17 and 85 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 17 and 85 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, 17 and 85: What are the Multiples of 17? What are the Multiples of 85? Let’s take a look at the first 10 multiples for each of these numbers, 17 and 85: First 10 Multiples of 17: 17, 34, 51, 68, 85, 102, 119, 136, 153, 170 First 10 Multiples of 85: 85, 170, 255, 340, 425, 510, 595, 680, 765, 850 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 17 and 85 are 85, 170, 255. Because 85 is the smallest, it is the least common multiple. The LCM of 17 and 85 is 85. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 136 and 35? What is the LCM of 116 and 9? What is the LCM of 54 and 51? What is the LCM of 150 and 94? What is the LCM of 106 and 103?