Solution: The GCF of 149 and 65 is 1
Methods
How to find the GCF of 149 and 65 using Prime Factorization
One way to find the GCF of 149 and 65 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 149?
What are the Factors of 65?
Here is the prime factorization of 149:
14
9
1
149^1
14 9 1
And this is the prime factorization of 65:
5
1
×
1
3
1
5^1 × 13^1
5 1 × 1 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 149 and 65 is 1.
Thus, the GCF of 149 and 65 is: 1
How to Find the GCF of 149 and 65 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 149 and 65 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, 149 and 65:
Factors of 149: 1, 149
Factors of 65: 1, 5, 13, 65
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 149 and 65 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 56 and 39?
What is the GCF of 30 and 125?
What is the GCF of 11 and 21?
What is the GCF of 85 and 13?
What is the GCF of 57 and 83?