Greatest Common Factor of 42, 7, 21, 40

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

• Greatest Common Factor of 42, 7, 21, 40 by common division method
• Greatest Common Factor of 42, 7, 21, 40 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 7

List of positive integer factors of 7 that divides 7 without a remainder.

1,7

Factors of 21

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

1,3,7,21

Factors of 40

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

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

Greatest Common Factor

We found the factors 42,7,21,40 . The biggest common factor number is the GCF number.
So the greatest common factor 42,7,21,40 is 1.

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

• GCF of 54, 7, 92, 36
• GCF of 47, 3, 76, 67
• GCF of 85, 6, 95, 30
• GCF of 53, 2, 69, 36
• GCF of 18, 3, 46, 12

1. What is the GCF of 42, 7, 21, 40?

Answer: GCF of 42, 7, 21, 40 is 1.

2. How to Find the GCF of 42, 7, 21, 40

Answer: Greatest Common Factor(GCF) of 42, 7, 21, 40 = 1

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

Step 2: Then multiply all the prime factors GCF(42, 7, 21, 40) = 1.