Greatest Common Factor of 42, 40, 80, 409

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

• Greatest Common Factor of 42, 40, 80, 409 by common division method
• Greatest Common Factor of 42, 40, 80, 409 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 40

List of positive integer factors of 40 that divides 40 without a remainder.

1,2,4,5,8,10,20,40

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Factors of 409

List of positive integer factors of 409 that divides 409 without a remainder.

1,409

Greatest Common Factor

We found the factors 42,40,80,409 . The biggest common factor number is the GCF number.
So the greatest common factor 42,40,80,409 is 1.

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

• GCF of 72, 51, 99, 290
• GCF of 24, 98, 47, 554
• GCF of 45, 73, 83, 107
• GCF of 35, 43, 56, 919
• GCF of 61, 18, 46, 595

1. What is the GCF of 42, 40, 80, 409?

Answer: GCF of 42, 40, 80, 409 is 1.

2. How to Find the GCF of 42, 40, 80, 409

Answer: Greatest Common Factor(GCF) of 42, 40, 80, 409 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 40, 80, 409) = 1.