Greatest Common Factor of 68, 81, 21, 63

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

• Greatest Common Factor of 68, 81, 21, 63 by common division method
• Greatest Common Factor of 68, 81, 21, 63 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 68

List of positive integer factors of 68 that divides 68 without a remainder.

1,2,4,17,34,68

Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 63

List of positive integer factors of 63 that divides 63 without a remainder.

1,3,7,9,21,63

Greatest Common Factor

We found the factors 68,81,21,63 . The biggest common factor number is the GCF number.
So the greatest common factor 68,81,21,63 is 1.

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

• GCF of 32, 26, 71, 89
• GCF of 41, 81, 69, 54
• GCF of 33, 47, 28, 82
• GCF of 60, 32, 10, 35
• GCF of 53, 89, 65, 84

1. What is the GCF of 68, 81, 21, 63?

Answer: GCF of 68, 81, 21, 63 is 1.

2. How to Find the GCF of 68, 81, 21, 63

Answer: Greatest Common Factor(GCF) of 68, 81, 21, 63 = 1

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

Step 2: Then multiply all the prime factors GCF(68, 81, 21, 63) = 1.