What is the Greatest Common Factor of 891 and 900?

Greatest common factor (GCF) of 891 and 900 is 9.

GCF(891,900) = 9

We will now calculate the prime factors of 891 and 900, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 891 and 900.

How to find the GCF of 891 and 900?

We will first find the prime factorization of 891 and 900. After we will calculate the factors of 891 and 900 and find the biggest common factor number .

Step-1: Prime Factorization of 891

Prime factors of 891 are 3, 11. Prime factorization of 891 in exponential form is:

891 = 3⁴ × 11¹

Step-2: Prime Factorization of 900

Prime factors of 900 are 2, 3, 5. Prime factorization of 900 in exponential form is:

900 = 2² × 3² × 5²

Step-3: Factors of 891

List of positive integer factors of 891 that divides 891 without a remainder.

1, 3, 9, 11, 27, 33, 81, 99, 297

Step-4: Factors of 900

List of positive integer factors of 900 that divides 891 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 25, 30, 36, 45, 50, 60, 75, 90, 100, 150, 180, 225, 300, 450

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 891 and 900. The biggest common factor number is the GCF number.
So the greatest common factor 891 and 900 is 9.

Also check out the Least Common Multiple of 891 and 900