Greatest Common Factor of 255 and 261

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 255, 261 i.e. 3 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 255 and 261 is 3.

GCF(255,261) = 3

GCF of 255 and 261

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

GCF of:
and

Greatest Common Factor of 255 and 261

GCF of 255 and 261 is 3

Prime Factorization of 255


3 255
5 85
17 17
1

Prime factors of 255 are 3,5,17. Prime factorization of 255 in exponential form is:

255 = 31×51×171

Prime Factorization of 261


3 261
3 87
29 29
1

Prime factors of 261 are 3,29. Prime factorization of 261 in exponential form is:

261 = 32×291

∴ So by taking common prime factors GCF of 255 and 261 is 3

Greatest Common Factor of 255 and 261 by matching factors method

Factors of 255

List of positive integer factors of 255 that divides 255 without a remainder.

1,3,5,15,17,51,85,255

Factors of 261

List of positive integer factors of 261 that divides 261 without a remainder.

1,3,9,29,87,261

Greatest Common Factor

We found the factors and prime factorization of 255 and 261. The biggest common factor number is the GCF number.
So the greatest common factor 255 and 261 is 3.

Also check out the Least Common Multiple of 255 and 261

Properties of GCF 255 and 261

(i) The GCF of 255 and 261 is associative

GCF of 255 and 261 = GCF of 261 and 255

Related Greatest Common Factor of 255

Related Greatest Common Factor of 261

Frequently Asked Questions on GCF of 255 and 261

1. What is the GCF of 255 and 261?

Answer: GCF of 255 and 261 is 3.

2. What are the Factors of 255?

Answer: Factors of 255 are 1, 3, 5, 15, 17, 51, 85, 255. There are 8 integers that are factors of 255. The greatest factor of 255 is 255.

3. What are the Factors of 261?

Answer: Factors of 261 are 1, 3, 9, 29, 87, 261. There are 6 integers that are factors of 261. The greatest factor of 261 is 261.

4. How to Find the GCF of 255 and 261?

Answer:

Greatest Common Factor of 255 and 261 = 3

Step 1: Find the prime factorization of 255

255 = 3 x 5 x 17

Step 2: Find the prime factorization of 261

261 = 3 x 3 x 29

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 255 and 261 is 3