What is the Greatest Common Factor of 261 and 280?

Greatest common factor (GCF) of 261 and 280 is 1.

GCF(261,280) = 1

We will now calculate the prime factors of 261 and 280, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 261 and 280.

How to find the GCF of 261 and 280?

We will first find the prime factorization of 261 and 280. After we will calculate the factors of 261 and 280 and find the biggest common factor number .

Step-1: Prime Factorization of 261

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

261 = 3² × 29¹

Step-2: Prime Factorization of 280

Prime factors of 280 are 2, 5, 7. Prime factorization of 280 in exponential form is:

280 = 2³ × 5¹ × 7¹

Step-3: Factors of 261

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

1, 3, 9, 29, 87

Step-4: Factors of 280

List of positive integer factors of 280 that divides 261 without a remainder.

1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 261 and 280. The biggest common factor number is the GCF number.
So the greatest common factor 261 and 280 is 1.

Also check out the Least Common Multiple of 261 and 280