Greatest Common Factor of 42, 30, 840

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

• Greatest Common Factor of 42, 30, 840 by common division method
• Greatest Common Factor of 42, 30, 840 with matching the biggest common factor

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∴ So the GCF of the given numbers is 2 x 3 = 6

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 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

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 42,30,840 . The biggest common factor number is the GCF number.
So the greatest common factor 42,30,840 is 6.

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

• GCF of 86, 23, 127
• GCF of 89, 23, 234
• GCF of 92, 15, 377
• GCF of 70, 67, 800
• GCF of 38, 33, 101

1. What is the GCF of 42, 30, 840?

Answer: GCF of 42, 30, 840 is 6.

2. How to Find the GCF of 42, 30, 840

Answer: Greatest Common Factor(GCF) of 42, 30, 840 = 6

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

Step 2: Then multiply all the prime factors GCF(42, 30, 840) = 6.