Q:

What is the GCF of 149 and 78?

Accepted Solution

A:
Solution: The GCF of 149 and 78 is 1 Methods How to find the GCF of 149 and 78 using Prime Factorization One way to find the GCF of 149 and 78 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 149? What are the Factors of 78? Here is the prime factorization of 149: 14 9 1 149^1 14 9 1 And this is the prime factorization of 78: 2 1 × 3 1 × 1 3 1 2^1 × 3^1 × 13^1 2 1 × 3 1 × 1 3 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 149 and 78 is 1. Thus, the GCF of 149 and 78 is: 1 How to Find the GCF of 149 and 78 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 149 and 78 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, 149 and 78: Factors of 149: 1, 149 Factors of 78: 1, 2, 3, 6, 13, 26, 39, 78 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 149 and 78 is 1. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 140 and 97? What is the GCF of 42 and 21? What is the GCF of 147 and 128? What is the GCF of 59 and 39? What is the GCF of 132 and 113?