Q:

What is the GCF of 5 and 57?

Accepted Solution

A:
Solution: The GCF of 5 and 57 is 1 Methods How to find the GCF of 5 and 57 using Prime Factorization One way to find the GCF of 5 and 57 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 5? What are the Factors of 57? Here is the prime factorization of 5: 5 1 5^1 5 1 And this is the prime factorization of 57: 3 1 × 1 9 1 3^1 × 19^1 3 1 × 1 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 5 and 57 is 1. Thus, the GCF of 5 and 57 is: 1 How to Find the GCF of 5 and 57 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 5 and 57 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, 5 and 57: Factors of 5: 1, 5 Factors of 57: 1, 3, 19, 57 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 5 and 57 is 1. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 99 and 20? What is the GCF of 30 and 94? What is the GCF of 55 and 71? What is the GCF of 148 and 130? What is the GCF of 126 and 6?