Greatest Common Factor of 21, 43, 686

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

• Greatest Common Factor of 21, 43, 686 by common division method
• Greatest Common Factor of 21, 43, 686 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 43

List of positive integer factors of 43 that divides 43 without a remainder.

1,43

Factors of 686

List of positive integer factors of 686 that divides 686 without a remainder.

1,2,7,14,49,98,343,686

Greatest Common Factor

We found the factors 21,43,686 . The biggest common factor number is the GCF number.
So the greatest common factor 21,43,686 is 1.

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

• GCF of 84, 91, 585
• GCF of 92, 39, 878
• GCF of 66, 59, 942
• GCF of 91, 97, 421
• GCF of 38, 84, 880

1. What is the GCF of 21, 43, 686?

Answer: GCF of 21, 43, 686 is 1.

2. How to Find the GCF of 21, 43, 686

Answer: Greatest Common Factor(GCF) of 21, 43, 686 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 43, 686) = 1.