Greatest Common Factor of 20, 30, 49, 71, 57

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

• Greatest Common Factor of 20, 30, 49, 71, 57 by common division method
• Greatest Common Factor of 20, 30, 49, 71, 57 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 20

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

1,2,4,5,10,20

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 49

List of positive integer factors of 49 that divides 49 without a remainder.

1,7,49

Factors of 71

List of positive integer factors of 71 that divides 71 without a remainder.

1,71

Factors of 57

List of positive integer factors of 57 that divides 57 without a remainder.

1,3,19,57

Greatest Common Factor

We found the factors 20,30,49,71,57 . The biggest common factor number is the GCF number.
So the greatest common factor 20,30,49,71,57 is 1.

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

• GCF of 58, 61, 63, 18, 51
• GCF of 56, 14, 13, 13, 97
• GCF of 44, 97, 69, 27, 67
• GCF of 25, 41, 90, 11, 58
• GCF of 49, 40, 99, 41, 52

1. What is the GCF of 20, 30, 49, 71, 57?

Answer: GCF of 20, 30, 49, 71, 57 is 1.

2. How to Find the GCF of 20, 30, 49, 71, 57

Answer: Greatest Common Factor(GCF) of 20, 30, 49, 71, 57 = 1

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

Step 2: Then multiply all the prime factors GCF(20, 30, 49, 71, 57) = 1.