Q:

What is the GCF of 128 and 90?

Accepted Solution

A:
Solution: The GCF of 128 and 90 is 2 Methods How to find the GCF of 128 and 90 using Prime Factorization One way to find the GCF of 128 and 90 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 128? What are the Factors of 90? Here is the prime factorization of 128: 2 7 2^7 2 7 And this is the prime factorization of 90: 2 1 × 3 2 × 5 1 2^1 × 3^2 × 5^1 2 1 × 3 2 × 5 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 128 and 90 by multiplying all the matching prime factors to get a GCF of 128 and 90 as 4: Thus, the GCF of 128 and 90 is: 4 How to Find the GCF of 128 and 90 by Listing All Common Factors The first step to this method of finding the Greatest Common Factor of 128 and 90 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, 128 and 90: Factors of 128: 1, 2, 4, 8, 16, 32, 64, 128 Factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 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 128 and 90 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 6 and 134? What is the GCF of 31 and 138? What is the GCF of 9 and 45? What is the GCF of 73 and 126? What is the GCF of 99 and 10?