Greatest Common Factor of 21, 64, 8

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

• Greatest Common Factor of 21, 64, 8 by common division method
• Greatest Common Factor of 21, 64, 8 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 64

List of positive integer factors of 64 that divides 64 without a remainder.

1,2,4,8,16,32,64

Factors of 8

List of positive integer factors of 8 that divides 8 without a remainder.

1,2,4,8

Greatest Common Factor

We found the factors 21,64,8 . The biggest common factor number is the GCF number.
So the greatest common factor 21,64,8 is 1.

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

• GCF of 91, 82, 1
• GCF of 90, 54, 8
• GCF of 15, 32, 7
• GCF of 77, 83, 7
• GCF of 19, 20, 5

1. What is the GCF of 21, 64, 8?

Answer: GCF of 21, 64, 8 is 1.

2. How to Find the GCF of 21, 64, 8

Answer: Greatest Common Factor(GCF) of 21, 64, 8 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 64, 8) = 1.