Greatest Common Factor of 42, 17, 840

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

• Greatest Common Factor of 42, 17, 840 by common division method
• Greatest Common Factor of 42, 17, 840 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 17

List of positive integer factors of 17 that divides 17 without a remainder.

1,17

Factors of 840

List of positive integer factors of 840 that divides 840 without a remainder.

1,2,3,4,5,6,7,8,10,12,14,15,20,21,24,28,30,35,40,42,56,60,70,84,105,120,140,168,210,280,420,840

Greatest Common Factor

We found the factors 42,17,840 . The biggest common factor number is the GCF number.
So the greatest common factor 42,17,840 is 1.

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

• GCF of 61, 25, 688
• GCF of 12, 43, 905
• GCF of 43, 29, 790
• GCF of 71, 71, 571
• GCF of 89, 25, 969

1. What is the GCF of 42, 17, 840?

Answer: GCF of 42, 17, 840 is 1.

2. How to Find the GCF of 42, 17, 840

Answer: Greatest Common Factor(GCF) of 42, 17, 840 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 17, 840) = 1.