Greatest Common Factor of 21, 84, 78, 847

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

• Greatest Common Factor of 21, 84, 78, 847 by common division method
• Greatest Common Factor of 21, 84, 78, 847 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 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

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 847

List of positive integer factors of 847 that divides 847 without a remainder.

1,7,11,77,121,847

Greatest Common Factor

We found the factors 21,84,78,847 . The biggest common factor number is the GCF number.
So the greatest common factor 21,84,78,847 is 1.

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

• GCF of 92, 41, 26, 664
• GCF of 13, 58, 97, 931
• GCF of 92, 17, 74, 273
• GCF of 99, 25, 18, 412
• GCF of 19, 80, 88, 218

1. What is the GCF of 21, 84, 78, 847?

Answer: GCF of 21, 84, 78, 847 is 1.

2. How to Find the GCF of 21, 84, 78, 847

Answer: Greatest Common Factor(GCF) of 21, 84, 78, 847 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 84, 78, 847) = 1.