Greatest Common Factor of 15, 81, 77, 420

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

• Greatest Common Factor of 15, 81, 77, 420 by common division method
• Greatest Common Factor of 15, 81, 77, 420 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 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 81

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

1,3,9,27,81

Factors of 77

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

1,7,11,77

Factors of 420

List of positive integer factors of 420 that divides 420 without a remainder.

1,2,3,4,5,6,7,10,12,14,15,20,21,28,30,35,42,60,70,84,105,140,210,420

Greatest Common Factor

We found the factors 15,81,77,420 . The biggest common factor number is the GCF number.
So the greatest common factor 15,81,77,420 is 1.

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

• GCF of 93, 20, 91, 399
• GCF of 96, 85, 50, 488
• GCF of 63, 30, 90, 767
• GCF of 86, 60, 86, 711
• GCF of 20, 46, 83, 728

1. What is the GCF of 15, 81, 77, 420?

Answer: GCF of 15, 81, 77, 420 is 1.

2. How to Find the GCF of 15, 81, 77, 420

Answer: Greatest Common Factor(GCF) of 15, 81, 77, 420 = 1

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

Step 2: Then multiply all the prime factors GCF(15, 81, 77, 420) = 1.