Solution: The LCM of 71 and 11 is 781
Methods
How to find the LCM of 71 and 11 using Prime Factorization
One way to find the LCM of 71 and 11 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 71?
What are the Factors of 11?
Here is the prime factorization of 71:
7
1
1
71^1
7 1 1
And this is the prime factorization of 11:
1
1
1
11^1
1 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: 71, 11
1
1
1
×
7
1
1
=
781
11^1 × 71^1 = 781
1 1 1 × 7 1 1 = 781
Through this we see that the LCM of 71 and 11 is 781.
How to Find the LCM of 71 and 11 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 71 and 11 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, 71 and 11:
What are the Multiples of 71?
What are the Multiples of 11?
Let’s take a look at the first 10 multiples for each of these numbers, 71 and 11:
First 10 Multiples of 71: 71, 142, 213, 284, 355, 426, 497, 568, 639, 710
First 10 Multiples of 11: 11, 22, 33, 44, 55, 66, 77, 88, 99, 110
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 71 and 11 are 781, 1562, 2343. Because 781 is the smallest, it is the least common multiple.
The LCM of 71 and 11 is 781.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 146 and 61?
What is the LCM of 11 and 73?
What is the LCM of 129 and 126?
What is the LCM of 27 and 39?
What is the LCM of 70 and 37?