Greatest Common Factor of 20, 12, 20, 77

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

• Greatest Common Factor of 20, 12, 20, 77 by common division method
• Greatest Common Factor of 20, 12, 20, 77 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 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 77

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

1,7,11,77

Greatest Common Factor

We found the factors 20,12,20,77 . The biggest common factor number is the GCF number.
So the greatest common factor 20,12,20,77 is 1.

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

• GCF of 20, 87, 70, 44
• GCF of 49, 47, 62, 35
• GCF of 29, 34, 82, 50
• GCF of 40, 51, 65, 95
• GCF of 55, 38, 54, 35

1. What is the GCF of 20, 12, 20, 77?

Answer: GCF of 20, 12, 20, 77 is 1.

2. How to Find the GCF of 20, 12, 20, 77

Answer: Greatest Common Factor(GCF) of 20, 12, 20, 77 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 12, 20, 77) = 1.