Greatest Common Factor of 18, 21, 88, 85

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

• Greatest Common Factor of 18, 21, 88, 85 by common division method
• Greatest Common Factor of 18, 21, 88, 85 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 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 21

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

1,3,7,21

Factors of 88

List of positive integer factors of 88 that divides 88 without a remainder.

1,2,4,8,11,22,44,88

Factors of 85

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

1,5,17,85

Greatest Common Factor

We found the factors 18,21,88,85 . The biggest common factor number is the GCF number.
So the greatest common factor 18,21,88,85 is 1.

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

• GCF of 80, 49, 24, 36
• GCF of 52, 44, 37, 64
• GCF of 94, 44, 67, 17
• GCF of 18, 98, 46, 53
• GCF of 81, 76, 72, 63

1. What is the GCF of 18, 21, 88, 85?

Answer: GCF of 18, 21, 88, 85 is 1.

2. How to Find the GCF of 18, 21, 88, 85

Answer: Greatest Common Factor(GCF) of 18, 21, 88, 85 = 1

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

Step 2: Then multiply all the prime factors GCF(18, 21, 88, 85) = 1.