Greatest Common Factor of 21, 88, 81

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

• Greatest Common Factor of 21, 88, 81 by common division method
• Greatest Common Factor of 21, 88, 81 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 88

List of positive integer factors of 88 that divides 88 without a remainder.

1,2,4,8,11,22,44,88

Factors of 81

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

1,3,9,27,81

Greatest Common Factor

We found the factors 21,88,81 . The biggest common factor number is the GCF number.
So the greatest common factor 21,88,81 is 1.

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

• GCF of 61, 71, 55
• GCF of 61, 25, 22
• GCF of 76, 48, 15
• GCF of 53, 71, 44
• GCF of 63, 25, 62

1. What is the GCF of 21, 88, 81?

Answer: GCF of 21, 88, 81 is 1.

2. How to Find the GCF of 21, 88, 81

Answer: Greatest Common Factor(GCF) of 21, 88, 81 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 88, 81) = 1.