Greatest Common Factor of 28, 21, 31, 990

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

• Greatest Common Factor of 28, 21, 31, 990 by common division method
• Greatest Common Factor of 28, 21, 31, 990 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 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 31

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

1,31

Factors of 990

List of positive integer factors of 990 that divides 990 without a remainder.

1,2,3,5,6,9,10,11,15,18,22,30,33,45,55,66,90,99,110,165,198,330,495,990

Greatest Common Factor

We found the factors 28,21,31,990 . The biggest common factor number is the GCF number.
So the greatest common factor 28,21,31,990 is 1.

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

• GCF of 57, 77, 12, 341
• GCF of 54, 86, 88, 504
• GCF of 70, 37, 88, 411
• GCF of 32, 57, 88, 651
• GCF of 33, 71, 91, 712

1. What is the GCF of 28, 21, 31, 990?

Answer: GCF of 28, 21, 31, 990 is 1.

2. How to Find the GCF of 28, 21, 31, 990

Answer: Greatest Common Factor(GCF) of 28, 21, 31, 990 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 21, 31, 990) = 1.