Greatest Common Factor of 399, 661, 21

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

• Greatest Common Factor of 399, 661, 21 by common division method
• Greatest Common Factor of 399, 661, 21 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 399

List of positive integer factors of 399 that divides 399 without a remainder.

1,3,7,19,21,57,133,399

Factors of 661

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

1,661

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 399,661,21 . The biggest common factor number is the GCF number.
So the greatest common factor 399,661,21 is 1.

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

• GCF of 401, 360, 59
• GCF of 617, 147, 76
• GCF of 393, 389, 69
• GCF of 363, 251, 41
• GCF of 338, 601, 16

1. What is the GCF of 399, 661, 21?

Answer: GCF of 399, 661, 21 is 1.

2. How to Find the GCF of 399, 661, 21

Answer: Greatest Common Factor(GCF) of 399, 661, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(399, 661, 21) = 1.