Greatest Common Factor of 285, 21, 28

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

• Greatest Common Factor of 285, 21, 28 by common division method
• Greatest Common Factor of 285, 21, 28 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 285

List of positive integer factors of 285 that divides 285 without a remainder.

1,3,5,15,19,57,95,285

Factors of 21

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

1,3,7,21

Factors of 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Greatest Common Factor

We found the factors 285,21,28 . The biggest common factor number is the GCF number.
So the greatest common factor 285,21,28 is 1.

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

• GCF of 601, 13, 45
• GCF of 924, 36, 89
• GCF of 592, 79, 27
• GCF of 725, 94, 13
• GCF of 629, 54, 24

1. What is the GCF of 285, 21, 28?

Answer: GCF of 285, 21, 28 is 1.

2. How to Find the GCF of 285, 21, 28

Answer: Greatest Common Factor(GCF) of 285, 21, 28 = 1

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

Step 2: Then multiply all the prime factors GCF(285, 21, 28) = 1.