Greatest Common Factor of 90, 98, 21

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

• Greatest Common Factor of 90, 98, 21 by common division method
• Greatest Common Factor of 90, 98, 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 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 98

List of positive integer factors of 98 that divides 98 without a remainder.

1,2,7,14,49,98

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 90,98,21 . The biggest common factor number is the GCF number.
So the greatest common factor 90,98,21 is 1.

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

• GCF of 36, 84, 47
• GCF of 99, 13, 85
• GCF of 16, 50, 38
• GCF of 17, 39, 92
• GCF of 16, 74, 86

1. What is the GCF of 90, 98, 21?

Answer: GCF of 90, 98, 21 is 1.

2. How to Find the GCF of 90, 98, 21

Answer: Greatest Common Factor(GCF) of 90, 98, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(90, 98, 21) = 1.