Greatest Common Factor of 21, 28, 423

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

• Greatest Common Factor of 21, 28, 423 by common division method
• Greatest Common Factor of 21, 28, 423 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 423

List of positive integer factors of 423 that divides 423 without a remainder.

1,3,9,47,141,423

Greatest Common Factor

We found the factors 21,28,423 . The biggest common factor number is the GCF number.
So the greatest common factor 21,28,423 is 1.

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

• GCF of 50, 27, 643
• GCF of 14, 64, 664
• GCF of 57, 14, 809
• GCF of 81, 43, 696
• GCF of 74, 83, 460

1. What is the GCF of 21, 28, 423?

Answer: GCF of 21, 28, 423 is 1.

2. How to Find the GCF of 21, 28, 423

Answer: Greatest Common Factor(GCF) of 21, 28, 423 = 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, 423) = 1.