GCD of 640, 434, 813, 805 Calculator

Given Input numbers are 640, 434, 813, 805

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

Divisors of 640

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

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

Divisors of 434

List of positive integer divisors of 434 that divides 434 without a remainder.

1, 2, 7, 14, 31, 62, 217, 434

Divisors of 813

List of positive integer divisors of 813 that divides 813 without a remainder.

1, 3, 271, 813

Divisors of 805

List of positive integer divisors of 805 that divides 805 without a remainder.

1, 5, 7, 23, 35, 115, 161, 805

Greatest Common Divisior

We found the divisors of 640, 434, 813, 805 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 640, 434, 813, 805 is 1.

Therefore, GCD of numbers 640, 434, 813, 805 is 1

Given Input Data is 640, 434, 813, 805

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

Prime Factorization of 640 is 2 x 2 x 2 x 2 x 2 x 2 x 2 x 5

Prime Factorization of 434 is 2 x 7 x 31

Prime Factorization of 813 is 3 x 271

Prime Factorization of 805 is 5 x 7 x 23

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(640, 434) = 138880

GCD(640, 434) = ( 640 x 434 ) / 138880

GCD(640, 434) = 277760 / 138880

GCD(640, 434) = 2

Step2:

Here we consider the GCD from the above i.e. 2 as first number and the next as 813

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

LCM(2, 813) = 1626

GCD(2, 813) = ( 2 x 813 ) / 1626

GCD(2, 813) = 1626 / 1626

GCD(2, 813) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 805

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

LCM(1, 805) = 805

GCD(1, 805) = ( 1 x 805 ) / 805

GCD(1, 805) = 805 / 805

GCD(1, 805) = 1

GCD of 640, 434, 813, 805 is 1

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1. What is the GCD of 640, 434, 813, 805?

GCD of 640, 434, 813, 805 is 1

2. Where do I get the detailed procedure to find GCD of 640, 434, 813, 805?

You can find a detailed procedure to find GCD of 640, 434, 813, 805 on our page.

3. How to find GCD of 640, 434, 813, 805 on a calculator?

You can find the GCD of 640, 434, 813, 805 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.