Q:

What is the GCF of 28 and 34?

Accepted Solution

A:
Solution: The GCF of 28 and 34 is 2 Methods How to find the GCF of 28 and 34 using Prime Factorization One way to find the GCF of 28 and 34 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 28? What are the Factors of 34? Here is the prime factorization of 28: 2 2 × 7 1 2^2 × 7^1 2 2 × 7 1 And this is the prime factorization of 34: 2 1 × 1 7 1 2^1 × 17^1 2 1 × 1 7 1 When you compare the prime factorization of these two numbers, you can see that there are matching prime factors. You can now find the Greatest Common Factor of 28 and 34 by multiplying all the matching prime factors to get a GCF of 28 and 34 as 4: Thus, the GCF of 28 and 34 is: 4 How to Find the GCF of 28 and 34 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 28 and 34 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, 28 and 34: Factors of 28: 1, 2, 4, 7, 14, 28 Factors of 34: 1, 2, 17, 34 When you compare the two lists of factors, you can see that the common factor(s) are 1, 2. Since 2 is the largest of these common factors, the GCF of 28 and 34 would be 2. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 121 and 109? What is the GCF of 47 and 139? What is the GCF of 142 and 43? What is the GCF of 52 and 103? What is the GCF of 51 and 7?