Greatest Common Factor of 21, 77, 72, 399

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

• Greatest Common Factor of 21, 77, 72, 399 by common division method
• Greatest Common Factor of 21, 77, 72, 399 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 77

List of positive integer factors of 77 that divides 77 without a remainder.

1,7,11,77

Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Factors of 399

List of positive integer factors of 399 that divides 399 without a remainder.

1,3,7,19,21,57,133,399

Greatest Common Factor

We found the factors 21,77,72,399 . The biggest common factor number is the GCF number.
So the greatest common factor 21,77,72,399 is 1.

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

• GCF of 12, 67, 86, 290
• GCF of 53, 27, 77, 265
• GCF of 65, 14, 75, 678
• GCF of 98, 75, 86, 953
• GCF of 16, 50, 28, 999

1. What is the GCF of 21, 77, 72, 399?

Answer: GCF of 21, 77, 72, 399 is 1.

2. How to Find the GCF of 21, 77, 72, 399

Answer: Greatest Common Factor(GCF) of 21, 77, 72, 399 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 77, 72, 399) = 1.