Greatest Common Factor of 855 and 858

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 855, 858 i.e. 3 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 855 and 858 is 3.

GCF(855,858) = 3

GCF of 855 and 858

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

GCF of:
and

Greatest Common Factor of 855 and 858

GCF of 855 and 858 is 3

Prime Factorization of 855


3 855
3 285
5 95
19 19
1

Prime factors of 855 are 3,5,19. Prime factorization of 855 in exponential form is:

855 = 32×51×191

Prime Factorization of 858


2 858
3 429
11 143
13 13
1

Prime factors of 858 are 2,3,11,13. Prime factorization of 858 in exponential form is:

858 = 21×31×111×131

∴ So by taking common prime factors GCF of 855 and 858 is 3

Greatest Common Factor of 855 and 858 by matching factors method

Factors of 855

List of positive integer factors of 855 that divides 855 without a remainder.

1,3,5,9,15,19,45,57,95,171,285,855

Factors of 858

List of positive integer factors of 858 that divides 858 without a remainder.

1,2,3,6,11,13,22,26,33,39,66,78,143,286,429,858

Greatest Common Factor

We found the factors and prime factorization of 855 and 858. The biggest common factor number is the GCF number.
So the greatest common factor 855 and 858 is 3.

Also check out the Least Common Multiple of 855 and 858

Properties of GCF 855 and 858

(i) The GCF of 855 and 858 is associative

GCF of 855 and 858 = GCF of 858 and 855

Related Greatest Common Factor of 855

Related Greatest Common Factor of 858

Frequently Asked Questions on GCF of 855 and 858

1. What is the GCF of 855 and 858?

Answer: GCF of 855 and 858 is 3.

2. What are the Factors of 855?

Answer: Factors of 855 are 1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855. There are 12 integers that are factors of 855. The greatest factor of 855 is 855.

3. What are the Factors of 858?

Answer: Factors of 858 are 1, 2, 3, 6, 11, 13, 22, 26, 33, 39, 66, 78, 143, 286, 429, 858. There are 16 integers that are factors of 858. The greatest factor of 858 is 858.

4. How to Find the GCF of 855 and 858?

Answer:

Greatest Common Factor of 855 and 858 = 3

Step 1: Find the prime factorization of 855

855 = 3 x 3 x 5 x 19

Step 2: Find the prime factorization of 858

858 = 2 x 3 x 11 x 13

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

GCF = 3

Step 4: Therefore, the greatest common factor of 855 and 858 is 3