Greatest Common Factor of 21, 10, 660

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

• Greatest Common Factor of 21, 10, 660 by common division method
• Greatest Common Factor of 21, 10, 660 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 21

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

1,3,7,21

Factors of 10

List of positive integer factors of 10 that divides 10 without a remainder.

1,2,5,10

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

Greatest Common Factor

We found the factors 21,10,660 . The biggest common factor number is the GCF number.
So the greatest common factor 21,10,660 is 1.

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

• GCF of 62, 97, 879
• GCF of 60, 98, 275
• GCF of 22, 72, 695
• GCF of 77, 79, 212
• GCF of 16, 40, 534

1. What is the GCF of 21, 10, 660?

Answer: GCF of 21, 10, 660 is 1.

2. How to Find the GCF of 21, 10, 660

Answer: Greatest Common Factor(GCF) of 21, 10, 660 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 10, 660) = 1.