Greatest Common Factor of 21, 90, 65, 2, 84

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

• Greatest Common Factor of 21, 90, 65, 2, 84 by common division method
• Greatest Common Factor of 21, 90, 65, 2, 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 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 65

List of positive integer factors of 65 that divides 65 without a remainder.

1,5,13,65

Factors of 2

List of positive integer factors of 2 that divides 2 without a remainder.

1,2

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 21,90,65,2,84 . The biggest common factor number is the GCF number.
So the greatest common factor 21,90,65,2,84 is 1.

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

• GCF of 77, 30, 29, 5, 49
• GCF of 43, 48, 50, 2, 24
• GCF of 79, 89, 81, 9, 21
• GCF of 55, 62, 41, 9, 38
• GCF of 77, 12, 78, 2, 59

1. What is the GCF of 21, 90, 65, 2, 84?

Answer: GCF of 21, 90, 65, 2, 84 is 1.

2. How to Find the GCF of 21, 90, 65, 2, 84

Answer: Greatest Common Factor(GCF) of 21, 90, 65, 2, 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, 90, 65, 2, 84) = 1.