Greatest Common Factor of 990, 647, 21

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

• Greatest Common Factor of 990, 647, 21 by common division method
• Greatest Common Factor of 990, 647, 21 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 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

Factors of 647

List of positive integer factors of 647 that divides 647 without a remainder.

1,647

Factors of 21

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

1,3,7,21

Greatest Common Factor

We found the factors 990,647,21 . The biggest common factor number is the GCF number.
So the greatest common factor 990,647,21 is 1.

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

• GCF of 678, 718, 75
• GCF of 168, 847, 42
• GCF of 384, 838, 21
• GCF of 812, 292, 43
• GCF of 215, 508, 20

1. What is the GCF of 990, 647, 21?

Answer: GCF of 990, 647, 21 is 1.

2. How to Find the GCF of 990, 647, 21

Answer: Greatest Common Factor(GCF) of 990, 647, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(990, 647, 21) = 1.