Greatest Common Factor of 21, 21, 42, 891

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 21, 21, 42, 891 by common division method
• Greatest Common Factor of 21, 21, 42, 891 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ So the GCF of the given numbers is 3 = 3

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 891

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

1,3,9,11,27,33,81,99,297,891

Greatest Common Factor

We found the factors 21,21,42,891 . The biggest common factor number is the GCF number.
So the greatest common factor 21,21,42,891 is 3.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 93, 74, 11, 113
• GCF of 71, 56, 26, 484
• GCF of 59, 30, 23, 343
• GCF of 80, 23, 92, 404
• GCF of 53, 69, 61, 661

1. What is the GCF of 21, 21, 42, 891?

Answer: GCF of 21, 21, 42, 891 is 3.

2. How to Find the GCF of 21, 21, 42, 891

Answer: Greatest Common Factor(GCF) of 21, 21, 42, 891 = 3

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(21, 21, 42, 891) = 3.