Greatest Common Factor of 21, 28, 43, 47

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

• Greatest Common Factor of 21, 28, 43, 47 by common division method
• Greatest Common Factor of 21, 28, 43, 47 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 43

List of positive integer factors of 43 that divides 43 without a remainder.

1,43

Factors of 47

List of positive integer factors of 47 that divides 47 without a remainder.

1,47

Greatest Common Factor

We found the factors 21,28,43,47 . The biggest common factor number is the GCF number.
So the greatest common factor 21,28,43,47 is 1.

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

• GCF of 66, 46, 51, 89
• GCF of 76, 33, 33, 52
• GCF of 13, 53, 41, 17
• GCF of 39, 55, 87, 34
• GCF of 39, 94, 23, 94

1. What is the GCF of 21, 28, 43, 47?

Answer: GCF of 21, 28, 43, 47 is 1.

2. How to Find the GCF of 21, 28, 43, 47

Answer: Greatest Common Factor(GCF) of 21, 28, 43, 47 = 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, 43, 47) = 1.