Greatest Common Factor of 42, 65, 640

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

• Greatest Common Factor of 42, 65, 640 by common division method
• Greatest Common Factor of 42, 65, 640 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 65

List of positive integer factors of 65 that divides 65 without a remainder.

1,5,13,65

Factors of 640

List of positive integer factors of 640 that divides 640 without a remainder.

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

Greatest Common Factor

We found the factors 42,65,640 . The biggest common factor number is the GCF number.
So the greatest common factor 42,65,640 is 1.

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

• GCF of 85, 36, 729
• GCF of 71, 92, 962
• GCF of 78, 91, 372
• GCF of 32, 11, 281
• GCF of 65, 67, 524

1. What is the GCF of 42, 65, 640?

Answer: GCF of 42, 65, 640 is 1.

2. How to Find the GCF of 42, 65, 640

Answer: Greatest Common Factor(GCF) of 42, 65, 640 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 65, 640) = 1.