Greatest Common Factor of 21, 28, 81, 924

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

• Greatest Common Factor of 21, 28, 81, 924 by common division method
• Greatest Common Factor of 21, 28, 81, 924 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 21

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

1,3,7,21

Factors of 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 924

List of positive integer factors of 924 that divides 924 without a remainder.

1,2,3,4,6,7,11,12,14,21,22,28,33,42,44,66,77,84,132,154,231,308,462,924

Greatest Common Factor

We found the factors 21,28,81,924 . The biggest common factor number is the GCF number.
So the greatest common factor 21,28,81,924 is 1.

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

• GCF of 47, 95, 25, 730
• GCF of 32, 87, 22, 177
• GCF of 49, 47, 17, 475
• GCF of 23, 33, 16, 579
• GCF of 94, 51, 67, 523

1. What is the GCF of 21, 28, 81, 924?

Answer: GCF of 21, 28, 81, 924 is 1.

2. How to Find the GCF of 21, 28, 81, 924

Answer: Greatest Common Factor(GCF) of 21, 28, 81, 924 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 28, 81, 924) = 1.