Greatest Common Factor of 21, 84, 23, 30

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

• Greatest Common Factor of 21, 84, 23, 30 by common division method
• Greatest Common Factor of 21, 84, 23, 30 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 23

List of positive integer factors of 23 that divides 23 without a remainder.

1,23

Factors of 30

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

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

Greatest Common Factor

We found the factors 21,84,23,30 . The biggest common factor number is the GCF number.
So the greatest common factor 21,84,23,30 is 1.

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

• GCF of 74, 45, 35, 67
• GCF of 15, 36, 29, 97
• GCF of 22, 12, 58, 25
• GCF of 96, 27, 96, 12
• GCF of 16, 67, 60, 21

1. What is the GCF of 21, 84, 23, 30?

Answer: GCF of 21, 84, 23, 30 is 1.

2. How to Find the GCF of 21, 84, 23, 30

Answer: Greatest Common Factor(GCF) of 21, 84, 23, 30 = 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, 23, 30) = 1.