Greatest Common Factor of 42, 78, 21, 10

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

• Greatest Common Factor of 42, 78, 21, 10 by common division method
• Greatest Common Factor of 42, 78, 21, 10 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 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 21

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

1,3,7,21

Factors of 10

List of positive integer factors of 10 that divides 10 without a remainder.

1,2,5,10

Greatest Common Factor

We found the factors 42,78,21,10 . The biggest common factor number is the GCF number.
So the greatest common factor 42,78,21,10 is 1.

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

• GCF of 36, 89, 77, 64
• GCF of 40, 94, 55, 29
• GCF of 28, 96, 93, 45
• GCF of 10, 90, 82, 34
• GCF of 45, 44, 96, 73

1. What is the GCF of 42, 78, 21, 10?

Answer: GCF of 42, 78, 21, 10 is 1.

2. How to Find the GCF of 42, 78, 21, 10

Answer: Greatest Common Factor(GCF) of 42, 78, 21, 10 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 78, 21, 10) = 1.