Greatest Common Factor of 21, 87, 139

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

• Greatest Common Factor of 21, 87, 139 by common division method
• Greatest Common Factor of 21, 87, 139 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 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Factors of 139

List of positive integer factors of 139 that divides 139 without a remainder.

1,139

Greatest Common Factor

We found the factors 21,87,139 . The biggest common factor number is the GCF number.
So the greatest common factor 21,87,139 is 1.

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

• GCF of 31, 29, 385
• GCF of 20, 85, 138
• GCF of 11, 42, 753
• GCF of 73, 44, 625
• GCF of 25, 98, 343

1. What is the GCF of 21, 87, 139?

Answer: GCF of 21, 87, 139 is 1.

2. How to Find the GCF of 21, 87, 139

Answer: Greatest Common Factor(GCF) of 21, 87, 139 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 87, 139) = 1.