Greatest Common Factor of 21, 51, 82, 70

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

• Greatest Common Factor of 21, 51, 82, 70 by common division method
• Greatest Common Factor of 21, 51, 82, 70 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 51

List of positive integer factors of 51 that divides 51 without a remainder.

1,3,17,51

Factors of 82

List of positive integer factors of 82 that divides 82 without a remainder.

1,2,41,82

Factors of 70

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

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

Greatest Common Factor

We found the factors 21,51,82,70 . The biggest common factor number is the GCF number.
So the greatest common factor 21,51,82,70 is 1.

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

• GCF of 93, 21, 33, 62
• GCF of 71, 45, 17, 30
• GCF of 64, 71, 10, 47
• GCF of 75, 84, 56, 45
• GCF of 74, 87, 21, 36

1. What is the GCF of 21, 51, 82, 70?

Answer: GCF of 21, 51, 82, 70 is 1.

2. How to Find the GCF of 21, 51, 82, 70

Answer: Greatest Common Factor(GCF) of 21, 51, 82, 70 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 51, 82, 70) = 1.