Q:

What is the GCF of 11 and 123?

Accepted Solution

A:
Solution: The GCF of 11 and 123 is 1 Methods How to find the GCF of 11 and 123 using Prime Factorization One way to find the GCF of 11 and 123 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 11? What are the Factors of 123? Here is the prime factorization of 11: 1 1 1 11^1 1 1 1 And this is the prime factorization of 123: 3 1 × 4 1 1 3^1 × 41^1 3 1 × 4 1 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 11 and 123 is 1. Thus, the GCF of 11 and 123 is: 1 How to Find the GCF of 11 and 123 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 11 and 123 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, 11 and 123: Factors of 11: 1, 11 Factors of 123: 1, 3, 41, 123 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 11 and 123 is 1. Find the GCF of Other Number Pairs Want more practice? Try some of these other GCF problems: What is the GCF of 56 and 28? What is the GCF of 147 and 29? What is the GCF of 65 and 66? What is the GCF of 55 and 76? What is the GCF of 50 and 144?