Greatest Common Factor of 42, 12, 21, 220

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

• Greatest Common Factor of 42, 12, 21, 220 by common division method
• Greatest Common Factor of 42, 12, 21, 220 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 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Factors of 21

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

1,3,7,21

Factors of 220

List of positive integer factors of 220 that divides 220 without a remainder.

1,2,4,5,10,11,20,22,44,55,110,220

Greatest Common Factor

We found the factors 42,12,21,220 . The biggest common factor number is the GCF number.
So the greatest common factor 42,12,21,220 is 1.

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

• GCF of 63, 81, 81, 549
• GCF of 36, 28, 26, 677
• GCF of 82, 17, 91, 299
• GCF of 48, 18, 11, 858
• GCF of 37, 18, 54, 344

1. What is the GCF of 42, 12, 21, 220?

Answer: GCF of 42, 12, 21, 220 is 1.

2. How to Find the GCF of 42, 12, 21, 220

Answer: Greatest Common Factor(GCF) of 42, 12, 21, 220 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 12, 21, 220) = 1.