Greatest Common Factor of 21, 30, 98, 138

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

• Greatest Common Factor of 21, 30, 98, 138 by common division method
• Greatest Common Factor of 21, 30, 98, 138 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 21

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

1,3,7,21

Factors of 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

Factors of 98

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

1,2,7,14,49,98

Factors of 138

List of positive integer factors of 138 that divides 138 without a remainder.

1,2,3,6,23,46,69,138

Greatest Common Factor

We found the factors 21,30,98,138 . The biggest common factor number is the GCF number.
So the greatest common factor 21,30,98,138 is 1.

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

• GCF of 31, 47, 82, 823
• GCF of 71, 54, 49, 132
• GCF of 48, 78, 17, 294
• GCF of 52, 16, 67, 561
• GCF of 63, 64, 48, 468

1. What is the GCF of 21, 30, 98, 138?

Answer: GCF of 21, 30, 98, 138 is 1.

2. How to Find the GCF of 21, 30, 98, 138

Answer: Greatest Common Factor(GCF) of 21, 30, 98, 138 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 30, 98, 138) = 1.