Greatest Common Factor of 21, 34, 87, 428

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

• Greatest Common Factor of 21, 34, 87, 428 by common division method
• Greatest Common Factor of 21, 34, 87, 428 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 34

List of positive integer factors of 34 that divides 34 without a remainder.

1,2,17,34

Factors of 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Factors of 428

List of positive integer factors of 428 that divides 428 without a remainder.

1,2,4,107,214,428

Greatest Common Factor

We found the factors 21,34,87,428 . The biggest common factor number is the GCF number.
So the greatest common factor 21,34,87,428 is 1.

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

• GCF of 41, 67, 33, 803
• GCF of 57, 19, 15, 166
• GCF of 65, 68, 75, 219
• GCF of 45, 90, 13, 364
• GCF of 43, 14, 20, 325

1. What is the GCF of 21, 34, 87, 428?

Answer: GCF of 21, 34, 87, 428 is 1.

2. How to Find the GCF of 21, 34, 87, 428

Answer: Greatest Common Factor(GCF) of 21, 34, 87, 428 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 34, 87, 428) = 1.