# Greatest Common Factor of 85 and 90

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 85, 90 i.e. 5 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 85 and 90 is 5.

GCF(85,90) = 5

## GCF of 85 and 90

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and ### GCF of 85 and 90 is 5

Prime Factorization of 85

 5 85 17 17 1

Prime factors of 85 are 5,17. Prime factorization of 85 in exponential form is:

85 = 51×171

Prime Factorization of 90

 2 90 3 45 3 15 5 5 1

Prime factors of 90 are 2,3,5. Prime factorization of 90 in exponential form is:

90 = 21×32×51

∴ So by taking common prime factors GCF of 85 and 90 is 5

### Greatest Common Factor of 85 and 90 by matching factors method

Factors of 85

List of positive integer factors of 85 that divides 85 without a remainder.

1,5,17,85

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Greatest Common Factor

We found the factors and prime factorization of 85 and 90. The biggest common factor number is the GCF number.
So the greatest common factor 85 and 90 is 5.

Also check out the Least Common Multiple of 85 and 90

### Properties of GCF 85 and 90

(i) The GCF of 85 and 90 is associative

GCF of 85 and 90 = GCF of 90 and 85

### Frequently Asked Questions on GCF of 85 and 90

1. What is the GCF of 85 and 90?

Answer: GCF of 85 and 90 is 5.

2. What are the Factors of 85?

Answer: Factors of 85 are 1, 5, 17, 85. There are 4 integers that are factors of 85. The greatest factor of 85 is 85.

3. What are the Factors of 90?

Answer: Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. There are 12 integers that are factors of 90. The greatest factor of 90 is 90.

4. How to Find the GCF of 85 and 90?

Greatest Common Factor of 85 and 90 = 5

Step 1: Find the prime factorization of 85

85 = 5 x 17

Step 2: Find the prime factorization of 90

90 = 2 x 3 x 3 x 5

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = 5

Step 4: Therefore, the greatest common factor of 85 and 90 is 5