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GCF of 85 and 90

Created By : Prasanna
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023

Want to know what the GCF of 85 and 90 is? We will not only show you the answer but will also teach you two different methods through which you can easily find the greatest common factor of 85 and 90. Otherwise, you can utilise our handy GCF Calculator tool to quickly get the result.

GCF of:
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Detailed Solution to Calculate GCF of 85, 90 using Factoring

In this method, we have to list the factors of 85 and 90 separately and then select the highest number that appears in both lists. This will be your greatest common factor.

The factors of 85 are 1 , 5 , 17 , and 85

The factors of 90 are 1 , 2 , 3 , 5 , 6 , 9 , 10 , 15 , 18 , 30 , 45 , and 90


As you can see from the aforementioned lists, the largest number that is present in both lists is 5. Therefore, we can determine that the GCF of 85 and 90 is 5.


Greatest Common Factor of 85, 90 with Prime Factorization

This is prime factorization. Essentially, you have to divide both 85 and 90 with the same prime number and keep going until the numbers can no longer be divided by the same prime number. At that point, you must stop the process and multiply the prime numbers on the left side. The result will be the greatest common factor.

5  85,   90
 17,   18

From the picture, we can see that 17 and 18 cannot be divided by the same number again. So, all we have to do is now multiply the prime numbers on the left.

5 = 5

Hence, the GCF of 85 and 90 is 5.

Find the GCF of 85 and 90

Given numbers are 85 and 90

To find the greatest common factor of 85 and 90

The GCF of 85 and 90 is 5.

FAQs on GCF of 85 and 90

1. What are the LCM and GCF of 85 and 90?

The LCM and GCF of 85 and 90 are 1530 and 5.

2. How to get the GCF of 85 and 90?

The GCF of 85 and 90 can be calculated by finding the factors of both numbers and identifying the highest common factor in both.

3. What are the Methods to Find GCF of 85, 90?

The 2 different methods to find the greatest common factor of 85 and 90 are prime factorization and factors of both numbers.