GCD of 21, 373, 656, 390 Calculator

Given Input numbers are 21, 373, 656, 390

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

Divisors of 21

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

1, 3, 7, 21

Divisors of 373

List of positive integer divisors of 373 that divides 373 without a remainder.

1, 373

Divisors of 656

List of positive integer divisors of 656 that divides 656 without a remainder.

1, 2, 4, 8, 16, 41, 82, 164, 328, 656

Divisors of 390

List of positive integer divisors of 390 that divides 390 without a remainder.

1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390

Greatest Common Divisior

We found the divisors of 21, 373, 656, 390 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 21, 373, 656, 390 is 1.

Therefore, GCD of numbers 21, 373, 656, 390 is 1

Given Input Data is 21, 373, 656, 390

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

Prime Factorization of 21 is 3 x 7

Prime Factorization of 373 is 373

Prime Factorization of 656 is 2 x 2 x 2 x 2 x 41

Prime Factorization of 390 is 2 x 3 x 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(21, 373) = 7833

GCD(21, 373) = ( 21 x 373 ) / 7833

GCD(21, 373) = 7833 / 7833

GCD(21, 373) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 656

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

LCM(1, 656) = 656

GCD(1, 656) = ( 1 x 656 ) / 656

GCD(1, 656) = 656 / 656

GCD(1, 656) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 390

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

LCM(1, 390) = 390

GCD(1, 390) = ( 1 x 390 ) / 390

GCD(1, 390) = 390 / 390

GCD(1, 390) = 1

GCD of 21, 373, 656, 390 is 1

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• GCD of 89, 480, 350, 113
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1. What is the GCD of 21, 373, 656, 390?

GCD of 21, 373, 656, 390 is 1

2. Where do I get the detailed procedure to find GCD of 21, 373, 656, 390?

You can find a detailed procedure to find GCD of 21, 373, 656, 390 on our page.

3. How to find GCD of 21, 373, 656, 390 on a calculator?

You can find the GCD of 21, 373, 656, 390 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.