Greatest Common Factor of 21, 10, 55, 686

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

• Greatest Common Factor of 21, 10, 55, 686 by common division method
• Greatest Common Factor of 21, 10, 55, 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 10

List of positive integer factors of 10 that divides 10 without a remainder.

1,2,5,10

Factors of 55

List of positive integer factors of 55 that divides 55 without a remainder.

1,5,11,55

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 21,10,55,686 . The biggest common factor number is the GCF number.
So the greatest common factor 21,10,55,686 is 1.

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

• GCF of 44, 76, 28, 238
• GCF of 84, 41, 19, 400
• GCF of 67, 88, 51, 889
• GCF of 69, 77, 68, 206
• GCF of 23, 98, 52, 157

1. What is the GCF of 21, 10, 55, 686?

Answer: GCF of 21, 10, 55, 686 is 1.

2. How to Find the GCF of 21, 10, 55, 686

Answer: Greatest Common Factor(GCF) of 21, 10, 55, 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, 10, 55, 686) = 1.