Solution: The GCF of 140 and 116 is 4
Methods
How to find the GCF of 140 and 116 using Prime Factorization
One way to find the GCF of 140 and 116 is to compare 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 116?
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 116:
2
2
×
2
9
1
2^2 × 29^1
2 2 × 2 9 1
When you compare the prime factorization of these two numbers, you can see that there are matching prime factors. You can now find the Greatest Common Factor of 140 and 116 by multiplying all the matching prime factors to get a GCF of 140 and 116 as 4:
Thus, the GCF of 140 and 116 is: 4
How to Find the GCF of 140 and 116 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 140 and 116 is to find and list all the factors of each number. Again, you can see how this is done by looking at the “Factors of” articles that are linked to above.
Let’s take a look at the factors for each of these numbers, 140 and 116:
Factors of 140: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140
Factors of 116: 1, 2, 4, 29, 58, 116
When you compare the two lists of factors, you can see that the common factor(s) are 1, 2, 4. Since 4 is the largest of these common factors, the GCF of 140 and 116 would be 4.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 103 and 109?
What is the GCF of 63 and 74?
What is the GCF of 76 and 9?
What is the GCF of 139 and 55?
What is the GCF of 85 and 31?