Greatest Common Factor of 21, 91, 51, 4, 85

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

• Greatest Common Factor of 21, 91, 51, 4, 85 by common division method
• Greatest Common Factor of 21, 91, 51, 4, 85 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 91

List of positive integer factors of 91 that divides 91 without a remainder.

1,7,13,91

Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 4

List of positive integer factors of 4 that divides 4 without a remainder.

1,2,4

Factors of 85

List of positive integer factors of 85 that divides 85 without a remainder.

1,5,17,85

Greatest Common Factor

We found the factors 21,91,51,4,85 . The biggest common factor number is the GCF number.
So the greatest common factor 21,91,51,4,85 is 1.

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

• GCF of 84, 40, 25, 7, 55
• GCF of 98, 33, 93, 1, 40
• GCF of 82, 64, 27, 7, 86
• GCF of 38, 64, 63, 1, 16
• GCF of 24, 78, 62, 9, 94

1. What is the GCF of 21, 91, 51, 4, 85?

Answer: GCF of 21, 91, 51, 4, 85 is 1.

2. How to Find the GCF of 21, 91, 51, 4, 85

Answer: Greatest Common Factor(GCF) of 21, 91, 51, 4, 85 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 91, 51, 4, 85) = 1.