Greatest Common Factor of 661, 259, 21

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

• Greatest Common Factor of 661, 259, 21 by common division method
• Greatest Common Factor of 661, 259, 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 661

List of positive integer factors of 661 that divides 661 without a remainder.

1,661

Factors of 259

List of positive integer factors of 259 that divides 259 without a remainder.

1,7,37,259

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 661,259,21 . The biggest common factor number is the GCF number.
So the greatest common factor 661,259,21 is 1.

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

• GCF of 356, 585, 58
• GCF of 271, 141, 99
• GCF of 541, 677, 98
• GCF of 799, 345, 90
• GCF of 715, 758, 79

1. What is the GCF of 661, 259, 21?

Answer: GCF of 661, 259, 21 is 1.

2. How to Find the GCF of 661, 259, 21

Answer: Greatest Common Factor(GCF) of 661, 259, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(661, 259, 21) = 1.