Greatest Common Factor of 78, 66, 21, 99

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

• Greatest Common Factor of 78, 66, 21, 99 by common division method
• Greatest Common Factor of 78, 66, 21, 99 with matching the biggest common factor

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

Factors of 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 66

List of positive integer factors of 66 that divides 66 without a remainder.

1,2,3,6,11,22,33,66

Factors of 21

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

1,3,7,21

Factors of 99

List of positive integer factors of 99 that divides 99 without a remainder.

1,3,9,11,33,99

Greatest Common Factor

We found the factors 78,66,21,99 . The biggest common factor number is the GCF number.
So the greatest common factor 78,66,21,99 is 3.

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

• GCF of 90, 27, 15, 85
• GCF of 10, 10, 39, 47
• GCF of 86, 10, 45, 22
• GCF of 20, 29, 13, 56
• GCF of 17, 48, 85, 20

1. What is the GCF of 78, 66, 21, 99?

Answer: GCF of 78, 66, 21, 99 is 3.

2. How to Find the GCF of 78, 66, 21, 99

Answer: Greatest Common Factor(GCF) of 78, 66, 21, 99 = 3

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

Step 2: Then multiply all the prime factors GCF(78, 66, 21, 99) = 3.