Greatest Common Factor of 81, 87, 31, 840

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

• Greatest Common Factor of 81, 87, 31, 840 by common division method
• Greatest Common Factor of 81, 87, 31, 840 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 81

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

1,3,9,27,81

Factors of 87

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

1,3,29,87

Factors of 31

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

1,31

Factors of 840

List of positive integer factors of 840 that divides 840 without a remainder.

1,2,3,4,5,6,7,8,10,12,14,15,20,21,24,28,30,35,40,42,56,60,70,84,105,120,140,168,210,280,420,840

Greatest Common Factor

We found the factors 81,87,31,840 . The biggest common factor number is the GCF number.
So the greatest common factor 81,87,31,840 is 1.

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

• GCF of 11, 30, 30, 444
• GCF of 34, 52, 42, 613
• GCF of 24, 93, 61, 872
• GCF of 52, 82, 89, 747
• GCF of 24, 30, 84, 169

1. What is the GCF of 81, 87, 31, 840?

Answer: GCF of 81, 87, 31, 840 is 1.

2. How to Find the GCF of 81, 87, 31, 840

Answer: Greatest Common Factor(GCF) of 81, 87, 31, 840 = 1

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

Step 2: Then multiply all the prime factors GCF(81, 87, 31, 840) = 1.