GCD of 68, 51, 21 Calculator

Given Input numbers are 68, 51, 21

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

Divisors of 68

List of positive integer divisors of 68 that divides 68 without a remainder.

1, 2, 4, 17, 34, 68

Divisors of 51

List of positive integer divisors of 51 that divides 51 without a remainder.

1, 3, 17, 51

Divisors of 21

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

1, 3, 7, 21

Greatest Common Divisior

We found the divisors of 68, 51, 21 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 68, 51, 21 is 1.

Therefore, GCD of numbers 68, 51, 21 is 1

Given Input Data is 68, 51, 21

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

Prime Factorization of 68 is 2 x 2 x 17

Prime Factorization of 51 is 3 x 17

Prime Factorization of 21 is 3 x 7

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(68, 51) = 204

GCD(68, 51) = ( 68 x 51 ) / 204

GCD(68, 51) = 3468 / 204

GCD(68, 51) = 17

Step2:

Here we consider the GCD from the above i.e. 17 as first number and the next as 21

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

LCM(17, 21) = 357

GCD(17, 21) = ( 17 x 21 ) / 357

GCD(17, 21) = 357 / 357

GCD(17, 21) = 1

GCD of 68, 51, 21 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 64, 20, 28
• GCD of 60, 87, 30
• GCD of 74, 56, 84
• GCD of 71, 46, 20
• GCD of 73, 10, 47

1. What is the GCD of 68, 51, 21?

GCD of 68, 51, 21 is 1

2. Where do I get the detailed procedure to find GCD of 68, 51, 21?

You can find a detailed procedure to find GCD of 68, 51, 21 on our page.

3. How to find GCD of 68, 51, 21 on a calculator?

You can find the GCD of 68, 51, 21 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.