Greatest Common Factor of 31, 42, 84, 20

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

• Greatest Common Factor of 31, 42, 84, 20 by common division method
• Greatest Common Factor of 31, 42, 84, 20 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 31

List of positive integer factors of 31 that divides 31 without a remainder.

1,31

Factors of 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 84

List of positive integer factors of 84 that divides 84 without a remainder.

1,2,3,4,6,7,12,14,21,28,42,84

Factors of 20

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

1,2,4,5,10,20

Greatest Common Factor

We found the factors 31,42,84,20 . The biggest common factor number is the GCF number.
So the greatest common factor 31,42,84,20 is 1.

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

• GCF of 28, 12, 20, 94
• GCF of 53, 58, 29, 42
• GCF of 23, 64, 11, 69
• GCF of 87, 86, 98, 25
• GCF of 40, 10, 30, 76

1. What is the GCF of 31, 42, 84, 20?

Answer: GCF of 31, 42, 84, 20 is 1.

2. How to Find the GCF of 31, 42, 84, 20

Answer: Greatest Common Factor(GCF) of 31, 42, 84, 20 = 1

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

Step 2: Then multiply all the prime factors GCF(31, 42, 84, 20) = 1.