GCD of 28, 81, 65 Calculator

Given Input numbers are 28, 81, 65

To find the GCD of numbers using factoring list out all the divisors of each number

Divisors of 28

List of positive integer divisors of 28 that divides 28 without a remainder.

1, 2, 4, 7, 14, 28

Divisors of 81

List of positive integer divisors of 81 that divides 81 without a remainder.

1, 3, 9, 27, 81

Divisors of 65

List of positive integer divisors of 65 that divides 65 without a remainder.

1, 5, 13, 65

Greatest Common Divisior

We found the divisors of 28, 81, 65 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 28, 81, 65 is 1.

Therefore, GCD of numbers 28, 81, 65 is 1

Given Input Data is 28, 81, 65

Make a list of Prime Factors of all the given numbers initially

Prime Factorization of 28 is 2 x 2 x 7

Prime Factorization of 81 is 3 x 3 x 3 x 3

Prime Factorization of 65 is 5 x 13

The above numbers do not have any common prime factor. So GCD is 1

Step1:

Let's calculate the GCD of first two numbers

The formula of GCD is GCD(a, b) = ( a x b) / LCM(a, b)

LCM(28, 81) = 2268

GCD(28, 81) = ( 28 x 81 ) / 2268

GCD(28, 81) = 2268 / 2268

GCD(28, 81) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 65

The formula of GCD is GCD(a, b) = ( a x b) / LCM(a, b)

LCM(1, 65) = 65

GCD(1, 65) = ( 1 x 65 ) / 65

GCD(1, 65) = 65 / 65

GCD(1, 65) = 1

GCD of 28, 81, 65 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 68, 20, 85
• GCD of 91, 80, 61
• GCD of 74, 53, 53
• GCD of 59, 76, 22
• GCD of 92, 42, 81

1. What is the GCD of 28, 81, 65?

GCD of 28, 81, 65 is 1

2. Where do I get the detailed procedure to find GCD of 28, 81, 65?

You can find a detailed procedure to find GCD of 28, 81, 65 on our page.

3. How to find GCD of 28, 81, 65 on a calculator?

You can find the GCD of 28, 81, 65 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.