Greatest Common Factor of 81, 21, 90, 129

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

• Greatest Common Factor of 81, 21, 90, 129 by common division method
• Greatest Common Factor of 81, 21, 90, 129 with matching the biggest common factor

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∴ So the GCF of the given numbers is 3 = 3

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 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 129

List of positive integer factors of 129 that divides 129 without a remainder.

1,3,43,129

Greatest Common Factor

We found the factors 81,21,90,129 . The biggest common factor number is the GCF number.
So the greatest common factor 81,21,90,129 is 3.

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

• GCF of 64, 31, 37, 820
• GCF of 91, 56, 97, 289
• GCF of 30, 23, 25, 993
• GCF of 39, 96, 43, 626
• GCF of 60, 30, 33, 310

1. What is the GCF of 81, 21, 90, 129?

Answer: GCF of 81, 21, 90, 129 is 3.

2. How to Find the GCF of 81, 21, 90, 129

Answer: Greatest Common Factor(GCF) of 81, 21, 90, 129 = 3

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

Step 2: Then multiply all the prime factors GCF(81, 21, 90, 129) = 3.