Q:

What is the GCF of 25 and 121?

Accepted Solution

A:
Solution: The GCF of 25 and 121 is 1 Methods How to find the GCF of 25 and 121 using Prime Factorization One way to find the GCF of 25 and 121 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 25? What are the Factors of 121? Here is the prime factorization of 25: 5 2 5^2 5 2 And this is the prime factorization of 121: 1 1 2 11^2 1 1 2 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 25 and 121 is 1. Thus, the GCF of 25 and 121 is: 1 How to Find the GCF of 25 and 121 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 25 and 121 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, 25 and 121: Factors of 25: 1, 5, 25 Factors of 121: 1, 11, 121 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 25 and 121 is 1. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 29 and 70? What is the GCF of 103 and 6? What is the GCF of 99 and 136? What is the GCF of 67 and 16? What is the GCF of 1 and 127?