GCD of 491, 390, 42, 399 Calculator

Given Input numbers are 491, 390, 42, 399

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

Divisors of 491

List of positive integer divisors of 491 that divides 491 without a remainder.

1, 491

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

Divisors of 42

List of positive integer divisors of 42 that divides 42 without a remainder.

1, 2, 3, 6, 7, 14, 21, 42

Divisors of 399

List of positive integer divisors of 399 that divides 399 without a remainder.

1, 3, 7, 19, 21, 57, 133, 399

Greatest Common Divisior

We found the divisors of 491, 390, 42, 399 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 491, 390, 42, 399 is 1.

Therefore, GCD of numbers 491, 390, 42, 399 is 1

Given Input Data is 491, 390, 42, 399

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

Prime Factorization of 491 is 491

Prime Factorization of 390 is 2 x 3 x 5 x 13

Prime Factorization of 42 is 2 x 3 x 7

Prime Factorization of 399 is 3 x 7 x 19

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(491, 390) = 191490

GCD(491, 390) = ( 491 x 390 ) / 191490

GCD(491, 390) = 191490 / 191490

GCD(491, 390) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 42

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

LCM(1, 42) = 42

GCD(1, 42) = ( 1 x 42 ) / 42

GCD(1, 42) = 42 / 42

GCD(1, 42) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 399

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

LCM(1, 399) = 399

GCD(1, 399) = ( 1 x 399 ) / 399

GCD(1, 399) = 399 / 399

GCD(1, 399) = 1

GCD of 491, 390, 42, 399 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 259, 188, 91, 928
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• GCD of 387, 867, 72, 360
• GCD of 307, 831, 69, 224
• GCD of 214, 262, 74, 174

1. What is the GCD of 491, 390, 42, 399?

GCD of 491, 390, 42, 399 is 1

2. Where do I get the detailed procedure to find GCD of 491, 390, 42, 399?

You can find a detailed procedure to find GCD of 491, 390, 42, 399 on our page.

3. How to find GCD of 491, 390, 42, 399 on a calculator?

You can find the GCD of 491, 390, 42, 399 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.