Greatest Common Factor of 85, 40, 21

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

• Greatest Common Factor of 85, 40, 21 by common division method
• Greatest Common Factor of 85, 40, 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 85

List of positive integer factors of 85 that divides 85 without a remainder.

1,5,17,85

Factors of 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

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 85,40,21 . The biggest common factor number is the GCF number.
So the greatest common factor 85,40,21 is 1.

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

• GCF of 90, 46, 66
• GCF of 81, 95, 82
• GCF of 52, 11, 26
• GCF of 47, 24, 94
• GCF of 48, 25, 19

1. What is the GCF of 85, 40, 21?

Answer: GCF of 85, 40, 21 is 1.

2. How to Find the GCF of 85, 40, 21

Answer: Greatest Common Factor(GCF) of 85, 40, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(85, 40, 21) = 1.