What is the Greatest Common Factor of 255 and 270?

Greatest common factor (GCF) of 255 and 270 is 15.

GCF(255,270) = 15

We will now calculate the prime factors of 255 and 270, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 255 and 270.

How to find the GCF of 255 and 270?

We will first find the prime factorization of 255 and 270. After we will calculate the factors of 255 and 270 and find the biggest common factor number .

Step-1: Prime Factorization of 255

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

255 = 3¹ × 5¹ × 17¹

Step-2: Prime Factorization of 270

Prime factors of 270 are 2, 3, 5. Prime factorization of 270 in exponential form is:

270 = 2¹ × 3³ × 5¹

Step-3: Factors of 255

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

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

Step-4: Factors of 270

List of positive integer factors of 270 that divides 255 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 90, 135

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 255 and 270. The biggest common factor number is the GCF number.
So the greatest common factor 255 and 270 is 15.

Also check out the Least Common Multiple of 255 and 270