Greatest Common Factor of 13, 60, 21, 640

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

• Greatest Common Factor of 13, 60, 21, 640 by common division method
• Greatest Common Factor of 13, 60, 21, 640 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 13

List of positive integer factors of 13 that divides 13 without a remainder.

1,13

Factors of 60

List of positive integer factors of 60 that divides 60 without a remainder.

1,2,3,4,5,6,10,12,15,20,30,60

Factors of 21

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

1,3,7,21

Factors of 640

List of positive integer factors of 640 that divides 640 without a remainder.

1,2,4,5,8,10,16,20,32,40,64,80,128,160,320,640

Greatest Common Factor

We found the factors 13,60,21,640 . The biggest common factor number is the GCF number.
So the greatest common factor 13,60,21,640 is 1.

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

• GCF of 59, 51, 88, 282
• GCF of 81, 62, 41, 624
• GCF of 32, 94, 26, 381
• GCF of 56, 73, 78, 441
• GCF of 21, 30, 76, 170

1. What is the GCF of 13, 60, 21, 640?

Answer: GCF of 13, 60, 21, 640 is 1.

2. How to Find the GCF of 13, 60, 21, 640

Answer: Greatest Common Factor(GCF) of 13, 60, 21, 640 = 1

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

Step 2: Then multiply all the prime factors GCF(13, 60, 21, 640) = 1.