Greatest Common Factor of 42, 21, 81, 290

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

• Greatest Common Factor of 42, 21, 81, 290 by common division method
• Greatest Common Factor of 42, 21, 81, 290 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 21

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

1,3,7,21

Factors of 81

List of positive integer factors of 81 that divides 81 without a remainder.

1,3,9,27,81

Factors of 290

List of positive integer factors of 290 that divides 290 without a remainder.

1,2,5,10,29,58,145,290

Greatest Common Factor

We found the factors 42,21,81,290 . The biggest common factor number is the GCF number.
So the greatest common factor 42,21,81,290 is 1.

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

• GCF of 63, 11, 28, 230
• GCF of 77, 32, 39, 787
• GCF of 17, 30, 12, 777
• GCF of 22, 77, 58, 402
• GCF of 58, 25, 63, 362

1. What is the GCF of 42, 21, 81, 290?

Answer: GCF of 42, 21, 81, 290 is 1.

2. How to Find the GCF of 42, 21, 81, 290

Answer: Greatest Common Factor(GCF) of 42, 21, 81, 290 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 21, 81, 290) = 1.