Solution: The GCF of 128 and 35 is 1
Methods
How to find the GCF of 128 and 35 using Prime Factorization
One way to find the GCF of 128 and 35 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 35?
Here is the prime factorization of 128:
2
7
2^7
2 7
And this is the prime factorization of 35:
5
1
×
7
1
5^1 × 7^1
5 1 × 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 35 is 1.
Thus, the GCF of 128 and 35 is: 1
How to Find the GCF of 128 and 35 by Listing All Common Factors
The first step to this method of finding the Greatest Common Factor of 128 and 35 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 35:
Factors of 128: 1, 2, 4, 8, 16, 32, 64, 128
Factors of 35: 1, 5, 7, 35
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 35 is 1.
Find the GCF of Other Number Pairs
Want more practice? Try some of these other GCF problems:
What is the GCF of 33 and 9?
What is the GCF of 38 and 93?
What is the GCF of 40 and 60?
What is the GCF of 127 and 92?
What is the GCF of 137 and 83?