Greatest Common Factor of 21, 30, 84, 556

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

• Greatest Common Factor of 21, 30, 84, 556 by common division method
• Greatest Common Factor of 21, 30, 84, 556 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 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

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 556

List of positive integer factors of 556 that divides 556 without a remainder.

1,2,4,139,278,556

Greatest Common Factor

We found the factors 21,30,84,556 . The biggest common factor number is the GCF number.
So the greatest common factor 21,30,84,556 is 1.

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

• GCF of 80, 93, 36, 216
• GCF of 85, 88, 69, 659
• GCF of 76, 13, 70, 350
• GCF of 45, 70, 42, 261
• GCF of 33, 98, 92, 428

1. What is the GCF of 21, 30, 84, 556?

Answer: GCF of 21, 30, 84, 556 is 1.

2. How to Find the GCF of 21, 30, 84, 556

Answer: Greatest Common Factor(GCF) of 21, 30, 84, 556 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 30, 84, 556) = 1.