Greatest Common Factor of 21, 42, 17, 457

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

• Greatest Common Factor of 21, 42, 17, 457 by common division method
• Greatest Common Factor of 21, 42, 17, 457 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 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

Factors of 17

List of positive integer factors of 17 that divides 17 without a remainder.

1,17

Factors of 457

List of positive integer factors of 457 that divides 457 without a remainder.

1,457

Greatest Common Factor

We found the factors 21,42,17,457 . The biggest common factor number is the GCF number.
So the greatest common factor 21,42,17,457 is 1.

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

• GCF of 60, 12, 56, 766
• GCF of 32, 97, 22, 721
• GCF of 21, 50, 48, 497
• GCF of 33, 61, 51, 930
• GCF of 33, 49, 43, 713

1. What is the GCF of 21, 42, 17, 457?

Answer: GCF of 21, 42, 17, 457 is 1.

2. How to Find the GCF of 21, 42, 17, 457

Answer: Greatest Common Factor(GCF) of 21, 42, 17, 457 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 42, 17, 457) = 1.