Q:

What is the GCF of 4 and 9?

Accepted Solution

A:
Solution: The GCF of 4 and 9 is 1 Methods How to find the GCF of 4 and 9 using Prime Factorization One way to find the GCF of 4 and 9 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 4? What are the Factors of 9? Here is the prime factorization of 4: 2 2 2^2 2 2 And this is the prime factorization of 9: 3 2 3^2 3 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 4 and 9 is 1. Thus, the GCF of 4 and 9 is: 1 How to Find the GCF of 4 and 9 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 4 and 9 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, 4 and 9: Factors of 4: 1, 2, 4 Factors of 9: 1, 3, 9 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 4 and 9 is 1. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 58 and 132? What is the GCF of 48 and 129? What is the GCF of 139 and 149? What is the GCF of 60 and 49? What is the GCF of 145 and 146?