Solution: The GCF of 116 and 115 is 1
Methods
How to find the GCF of 116 and 115 using Prime Factorization
One way to find the GCF of 116 and 115 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 116?
What are the Factors of 115?
Here is the prime factorization of 116:
2
2
×
2
9
1
2^2 × 29^1
2 2 × 2 9 1
And this is the prime factorization of 115:
5
1
×
2
3
1
5^1 × 23^1
5 1 × 2 3 1
When you compare the prime factorization of these two numbers, you can see that there are no matching prime factors. When this is the case, it means that there are no common factors between these two numbers. As a result, the GCF of 116 and 115 is 1.
Thus, the GCF of 116 and 115 is: 1
How to Find the GCF of 116 and 115 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 116 and 115 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, 116 and 115:
Factors of 116: 1, 2, 4, 29, 58, 116
Factors of 115: 1, 5, 23, 115
When you compare the two lists of factors, you can see that the only common factor is 1. So, in this case, the GCF of 116 and 115 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 81 and 85?
What is the GCF of 127 and 149?
What is the GCF of 126 and 5?
What is the GCF of 118 and 26?
What is the GCF of 8 and 91?