Greatest Common Factor of 21, 70, 78, 557

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

• Greatest Common Factor of 21, 70, 78, 557 by common division method
• Greatest Common Factor of 21, 70, 78, 557 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 21

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

1,3,7,21

Factors of 70

List of positive integer factors of 70 that divides 70 without a remainder.

1,2,5,7,10,14,35,70

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 557

List of positive integer factors of 557 that divides 557 without a remainder.

1,557

Greatest Common Factor

We found the factors 21,70,78,557 . The biggest common factor number is the GCF number.
So the greatest common factor 21,70,78,557 is 1.

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

• GCF of 35, 53, 71, 956
• GCF of 87, 76, 76, 255
• GCF of 22, 63, 77, 535
• GCF of 87, 99, 21, 618
• GCF of 11, 38, 79, 573

1. What is the GCF of 21, 70, 78, 557?

Answer: GCF of 21, 70, 78, 557 is 1.

2. How to Find the GCF of 21, 70, 78, 557

Answer: Greatest Common Factor(GCF) of 21, 70, 78, 557 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 70, 78, 557) = 1.