Solution: The GCF of 118 and 89 is 1
Methods
How to find the GCF of 118 and 89 using Prime Factorization
One way to find the GCF of 118 and 89 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 118?
What are the Factors of 89?
Here is the prime factorization of 118:
2
1
×
5
9
1
2^1 × 59^1
2 1 × 5 9 1
And this is the prime factorization of 89:
8
9
1
89^1
8 9 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 118 and 89 is 1.
Thus, the GCF of 118 and 89 is: 1
How to Find the GCF of 118 and 89 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 118 and 89 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, 118 and 89:
Factors of 118: 1, 2, 59, 118
Factors of 89: 1, 89
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 118 and 89 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 79 and 61?
What is the GCF of 108 and 99?
What is the GCF of 83 and 10?
What is the GCF of 88 and 137?
What is the GCF of 52 and 12?