Greatest Common Factor of 17, 87, 90, 67, 21

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

• Greatest Common Factor of 17, 87, 90, 67, 21 by common division method
• Greatest Common Factor of 17, 87, 90, 67, 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 17

List of positive integer factors of 17 that divides 17 without a remainder.

1,17

Factors of 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 67

List of positive integer factors of 67 that divides 67 without a remainder.

1,67

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 17,87,90,67,21 . The biggest common factor number is the GCF number.
So the greatest common factor 17,87,90,67,21 is 1.

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

• GCF of 22, 64, 88, 85, 56
• GCF of 60, 53, 73, 37, 31
• GCF of 91, 20, 96, 14, 56
• GCF of 82, 63, 35, 59, 16
• GCF of 93, 50, 40, 78, 60

1. What is the GCF of 17, 87, 90, 67, 21?

Answer: GCF of 17, 87, 90, 67, 21 is 1.

2. How to Find the GCF of 17, 87, 90, 67, 21

Answer: Greatest Common Factor(GCF) of 17, 87, 90, 67, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(17, 87, 90, 67, 21) = 1.