Greatest Common Factor of 660, 489, 21

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

• Greatest Common Factor of 660, 489, 21 by common division method
• Greatest Common Factor of 660, 489, 21 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ So the GCF of the given numbers is 3 = 3

Factors of 660

List of positive integer factors of 660 that divides 660 without a remainder.

1,2,3,4,5,6,10,11,12,15,20,22,30,33,44,55,60,66,110,132,165,220,330,660

Factors of 489

List of positive integer factors of 489 that divides 489 without a remainder.

1,3,163,489

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 660,489,21 . The biggest common factor number is the GCF number.
So the greatest common factor 660,489,21 is 3.

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

• GCF of 840, 843, 44
• GCF of 687, 940, 31
• GCF of 604, 368, 39
• GCF of 535, 896, 34
• GCF of 988, 284, 89

1. What is the GCF of 660, 489, 21?

Answer: GCF of 660, 489, 21 is 3.

2. How to Find the GCF of 660, 489, 21

Answer: Greatest Common Factor(GCF) of 660, 489, 21 = 3

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

Step 2: Then multiply all the prime factors GCF(660, 489, 21) = 3.