Greatest Common Factor of 1815 and 1821

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 1815, 1821 i.e. 3 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 1815 and 1821 is 3.

GCF(1815,1821) = 3

GCF of 1815 and 1821

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

GCF of:
and

Greatest Common Factor of 1815 and 1821

GCF of 1815 and 1821 is 3

Prime Factorization of 1815


3 1815
5 605
11 121
11 11
1

Prime factors of 1815 are 3,5,11. Prime factorization of 1815 in exponential form is:

1815 = 31×51×112

Prime Factorization of 1821


3 1821
607 607
1

Prime factors of 1821 are 3,607. Prime factorization of 1821 in exponential form is:

1821 = 31×6071

∴ So by taking common prime factors GCF of 1815 and 1821 is 3

Greatest Common Factor of 1815 and 1821 by matching factors method

Factors of 1815

List of positive integer factors of 1815 that divides 1815 without a remainder.

1,3,5,11,15,33,55,121,165,363,605,1815

Factors of 1821

List of positive integer factors of 1821 that divides 1821 without a remainder.

1,3,607,1821

Greatest Common Factor

We found the factors and prime factorization of 1815 and 1821. The biggest common factor number is the GCF number.
So the greatest common factor 1815 and 1821 is 3.

Also check out the Least Common Multiple of 1815 and 1821

Properties of GCF 1815 and 1821

(i) The GCF of 1815 and 1821 is associative

GCF of 1815 and 1821 = GCF of 1821 and 1815

Related Greatest Common Factor of 1815

Related Greatest Common Factor of 1821

Frequently Asked Questions on GCF of 1815 and 1821

1. What is the GCF of 1815 and 1821?

Answer: GCF of 1815 and 1821 is 3.

2. What are the Factors of 1815?

Answer: Factors of 1815 are 1, 3, 5, 11, 15, 33, 55, 121, 165, 363, 605, 1815. There are 12 integers that are factors of 1815. The greatest factor of 1815 is 1815.

3. What are the Factors of 1821?

Answer: Factors of 1821 are 1, 3, 607, 1821. There are 4 integers that are factors of 1821. The greatest factor of 1821 is 1821.

4. How to Find the GCF of 1815 and 1821?

Answer:

Greatest Common Factor of 1815 and 1821 = 3

Step 1: Find the prime factorization of 1815

1815 = 3 x 5 x 11 x 11

Step 2: Find the prime factorization of 1821

1821 = 3 x 607

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 1815 and 1821 is 3