Greatest Common Factor of 21, 78, 91, 84

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

• Greatest Common Factor of 21, 78, 91, 84 by common division method
• Greatest Common Factor of 21, 78, 91, 84 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 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 91

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

1,7,13,91

Factors of 84

List of positive integer factors of 84 that divides 84 without a remainder.

1,2,3,4,6,7,12,14,21,28,42,84

Greatest Common Factor

We found the factors 21,78,91,84 . The biggest common factor number is the GCF number.
So the greatest common factor 21,78,91,84 is 1.

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

• GCF of 87, 96, 28, 47
• GCF of 93, 78, 76, 84
• GCF of 99, 21, 22, 83
• GCF of 29, 93, 31, 87
• GCF of 81, 28, 73, 34

1. What is the GCF of 21, 78, 91, 84?

Answer: GCF of 21, 78, 91, 84 is 1.

2. How to Find the GCF of 21, 78, 91, 84

Answer: Greatest Common Factor(GCF) of 21, 78, 91, 84 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 78, 91, 84) = 1.