Greatest Common Factor of 45, 79, 91, 21

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

• Greatest Common Factor of 45, 79, 91, 21 by common division method
• Greatest Common Factor of 45, 79, 91, 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 45

List of positive integer factors of 45 that divides 45 without a remainder.

1,3,5,9,15,45

Factors of 79

List of positive integer factors of 79 that divides 79 without a remainder.

1,79

Factors of 91

List of positive integer factors of 91 that divides 91 without a remainder.

1,7,13,91

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 45,79,91,21 . The biggest common factor number is the GCF number.
So the greatest common factor 45,79,91,21 is 1.

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

• GCF of 81, 71, 53, 60
• GCF of 92, 21, 49, 47
• GCF of 86, 25, 82, 63
• GCF of 55, 91, 88, 27
• GCF of 42, 25, 81, 48

1. What is the GCF of 45, 79, 91, 21?

Answer: GCF of 45, 79, 91, 21 is 1.

2. How to Find the GCF of 45, 79, 91, 21

Answer: Greatest Common Factor(GCF) of 45, 79, 91, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(45, 79, 91, 21) = 1.