Greatest Common Factor of 21, 74, 100, 645

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

• Greatest Common Factor of 21, 74, 100, 645 by common division method
• Greatest Common Factor of 21, 74, 100, 645 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 74

List of positive integer factors of 74 that divides 74 without a remainder.

1,2,37,74

Factors of 100

List of positive integer factors of 100 that divides 100 without a remainder.

1,2,4,5,10,20,25,50,100

Factors of 645

List of positive integer factors of 645 that divides 645 without a remainder.

1,3,5,15,43,129,215,645

Greatest Common Factor

We found the factors 21,74,100,645 . The biggest common factor number is the GCF number.
So the greatest common factor 21,74,100,645 is 1.

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

• GCF of 40, 11, 584, 267
• GCF of 11, 83, 787, 453
• GCF of 90, 15, 259, 758
• GCF of 17, 25, 614, 381
• GCF of 90, 97, 709, 125

1. What is the GCF of 21, 74, 100, 645?

Answer: GCF of 21, 74, 100, 645 is 1.

2. How to Find the GCF of 21, 74, 100, 645

Answer: Greatest Common Factor(GCF) of 21, 74, 100, 645 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 74, 100, 645) = 1.