Solution: The LCM of 140 and 88 is 3080
Methods
How to find the LCM of 140 and 88 using Prime Factorization
One way to find the LCM of 140 and 88 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 88?
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 88:
2
3
×
1
1
1
2^3 × 11^1
2 3 × 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: 2, 5, 7, 11
2
3
×
5
1
×
7
1
×
1
1
1
=
3080
2^3 × 5^1 × 7^1 × 11^1 = 3080
2 3 × 5 1 × 7 1 × 1 1 1 = 3080
Through this we see that the LCM of 140 and 88 is 3080.
How to Find the LCM of 140 and 88 by Listing Common Multiples
The first step to this method of finding the Least Common Multiple of 140 and 88 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 88:
What are the Multiples of 140?
What are the Multiples of 88?
Let’s take a look at the first 10 multiples for each of these numbers, 140 and 88:
First 10 Multiples of 140: 140, 280, 420, 560, 700, 840, 980, 1120, 1260, 1400
First 10 Multiples of 88: 88, 176, 264, 352, 440, 528, 616, 704, 792, 880
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 88 are 3080, 6160, 9240. Because 3080 is the smallest, it is the least common multiple.
The LCM of 140 and 88 is 3080.
Find the LCM of Other Number Pairs
Want more practice? Try some of these other LCM problems:
What is the LCM of 144 and 74?
What is the LCM of 59 and 13?
What is the LCM of 139 and 35?
What is the LCM of 98 and 104?
What is the LCM of 92 and 33?