Greatest Common Factor of 57, 68, 40, 21

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

• Greatest Common Factor of 57, 68, 40, 21 by common division method
• Greatest Common Factor of 57, 68, 40, 21 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 57

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

1,3,19,57

Factors of 68

List of positive integer factors of 68 that divides 68 without a remainder.

1,2,4,17,34,68

Factors of 40

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

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

Factors of 21

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

1,3,7,21

Greatest Common Factor

We found the factors 57,68,40,21 . The biggest common factor number is the GCF number.
So the greatest common factor 57,68,40,21 is 1.

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

• GCF of 23, 89, 83, 21
• GCF of 18, 78, 34, 82
• GCF of 21, 68, 44, 14
• GCF of 93, 45, 20, 68
• GCF of 37, 83, 36, 65

1. What is the GCF of 57, 68, 40, 21?

Answer: GCF of 57, 68, 40, 21 is 1.

2. How to Find the GCF of 57, 68, 40, 21

Answer: Greatest Common Factor(GCF) of 57, 68, 40, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(57, 68, 40, 21) = 1.