What is the Greatest Common Factor of 279 and 285?

Greatest common factor (GCF) of 279 and 285 is 3.

GCF(279,285) = 3

We will now calculate the prime factors of 279 and 285, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 279 and 285.

How to find the GCF of 279 and 285?

We will first find the prime factorization of 279 and 285. After we will calculate the factors of 279 and 285 and find the biggest common factor number .

Step-1: Prime Factorization of 279

Prime factors of 279 are 3, 31. Prime factorization of 279 in exponential form is:

279 = 3² × 31¹

Step-2: Prime Factorization of 285

Prime factors of 285 are 3, 5, 19. Prime factorization of 285 in exponential form is:

285 = 3¹ × 5¹ × 19¹

Step-3: Factors of 279

List of positive integer factors of 279 that divides 279 without a remainder.

1, 3, 9, 31, 93

Step-4: Factors of 285

List of positive integer factors of 285 that divides 279 without a remainder.

1, 3, 5, 15, 19, 57, 95

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 279 and 285. The biggest common factor number is the GCF number.
So the greatest common factor 279 and 285 is 3.

Also check out the Least Common Multiple of 279 and 285