Greatest Common Factor of 25, 20, 42, 15

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

• Greatest Common Factor of 25, 20, 42, 15 by common division method
• Greatest Common Factor of 25, 20, 42, 15 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 25

List of positive integer factors of 25 that divides 25 without a remainder.

1,5,25

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

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 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Greatest Common Factor

We found the factors 25,20,42,15 . The biggest common factor number is the GCF number.
So the greatest common factor 25,20,42,15 is 1.

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

• GCF of 54, 80, 18, 82
• GCF of 31, 30, 55, 31
• GCF of 10, 83, 35, 84
• GCF of 96, 28, 19, 76
• GCF of 94, 74, 36, 53

1. What is the GCF of 25, 20, 42, 15?

Answer: GCF of 25, 20, 42, 15 is 1.

2. How to Find the GCF of 25, 20, 42, 15

Answer: Greatest Common Factor(GCF) of 25, 20, 42, 15 = 1

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

Step 2: Then multiply all the prime factors GCF(25, 20, 42, 15) = 1.