Q:

What is the LCM of 140 and 141?

Accepted Solution

A:
Solution: The LCM of 140 and 141 is 19740 Methods How to find the LCM of 140 and 141 using Prime Factorization One way to find the LCM of 140 and 141 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 140? What are the Factors of 141? Here is the prime factorization of 140: 2 2 × 5 1 × 7 1 2^2 × 5^1 × 7^1 2 2 × 5 1 × 7 1 And this is the prime factorization of 141: 3 1 × 4 7 1 3^1 × 47^1 3 1 × 4 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: 2, 5, 7, 3, 47 2 2 × 3 1 × 5 1 × 7 1 × 4 7 1 = 19740 2^2 × 3^1 × 5^1 × 7^1 × 47^1 = 19740 2 2 × 3 1 × 5 1 × 7 1 × 4 7 1 = 19740 Through this we see that the LCM of 140 and 141 is 19740. How to Find the LCM of 140 and 141 by Listing Common Multiples The first step to this method of finding the Least Common Multiple of 140 and 141 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, 140 and 141: What are the Multiples of 140? What are the Multiples of 141? Let’s take a look at the first 10 multiples for each of these numbers, 140 and 141: First 10 Multiples of 140: 140, 280, 420, 560, 700, 840, 980, 1120, 1260, 1400 First 10 Multiples of 141: 141, 282, 423, 564, 705, 846, 987, 1128, 1269, 1410 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 140 and 141 are 19740, 39480, 59220. Because 19740 is the smallest, it is the least common multiple. The LCM of 140 and 141 is 19740. Find the LCM of Other Number Pairs Want more practice? Try some of these other LCM problems: What is the LCM of 20 and 98? What is the LCM of 31 and 130? What is the LCM of 103 and 136? What is the LCM of 80 and 32? What is the LCM of 117 and 12?