Greatest Common Factor of 21, 81, 51, 672

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

• Greatest Common Factor of 21, 81, 51, 672 by common division method
• Greatest Common Factor of 21, 81, 51, 672 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 21

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

1,3,7,21

Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 672

List of positive integer factors of 672 that divides 672 without a remainder.

1,2,3,4,6,7,8,12,14,16,21,24,28,32,42,48,56,84,96,112,168,224,336,672

Greatest Common Factor

We found the factors 21,81,51,672 . The biggest common factor number is the GCF number.
So the greatest common factor 21,81,51,672 is 3.

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

• GCF of 94, 89, 86, 612
• GCF of 52, 43, 41, 672
• GCF of 64, 81, 13, 826
• GCF of 69, 56, 78, 326
• GCF of 43, 51, 65, 477

1. What is the GCF of 21, 81, 51, 672?

Answer: GCF of 21, 81, 51, 672 is 3.

2. How to Find the GCF of 21, 81, 51, 672

Answer: Greatest Common Factor(GCF) of 21, 81, 51, 672 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 81, 51, 672) = 3.