Greatest Common Factor of 21, 91, 51, 34

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

• Greatest Common Factor of 21, 91, 51, 34 by common division method
• Greatest Common Factor of 21, 91, 51, 34 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 34

List of positive integer factors of 34 that divides 34 without a remainder.

1,2,17,34

Greatest Common Factor

We found the factors 21,91,51,34 . The biggest common factor number is the GCF number.
So the greatest common factor 21,91,51,34 is 1.

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

• GCF of 20, 60, 66, 73
• GCF of 94, 72, 76, 47
• GCF of 11, 57, 50, 78
• GCF of 72, 26, 99, 71
• GCF of 77, 22, 84, 61

1. What is the GCF of 21, 91, 51, 34?

Answer: GCF of 21, 91, 51, 34 is 1.

2. How to Find the GCF of 21, 91, 51, 34

Answer: Greatest Common Factor(GCF) of 21, 91, 51, 34 = 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, 34) = 1.