Solution: The GCF of 128 and 37 is 1
Methods
How to find the GCF of 128 and 37 using Prime Factorization
One way to find the GCF of 128 and 37 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 128?
What are the Factors of 37?
Here is the prime factorization of 128:
2
7
2^7
2 7
And this is the prime factorization of 37:
3
7
1
37^1
3 7 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 128 and 37 is 1.
Thus, the GCF of 128 and 37 is: 1
How to Find the GCF of 128 and 37 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 128 and 37 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, 128 and 37:
Factors of 128: 1, 2, 4, 8, 16, 32, 64, 128
Factors of 37: 1, 37
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 128 and 37 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 8 and 53?
What is the GCF of 117 and 142?
What is the GCF of 77 and 61?
What is the GCF of 144 and 63?
What is the GCF of 73 and 20?