GCD of 420, 136, 637, 665 Calculator

Given Input numbers are 420, 136, 637, 665

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

Divisors of 420

List of positive integer divisors of 420 that divides 420 without a remainder.

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420

Divisors of 136

List of positive integer divisors of 136 that divides 136 without a remainder.

1, 2, 4, 8, 17, 34, 68, 136

Divisors of 637

List of positive integer divisors of 637 that divides 637 without a remainder.

1, 7, 13, 49, 91, 637

Divisors of 665

List of positive integer divisors of 665 that divides 665 without a remainder.

1, 5, 7, 19, 35, 95, 133, 665

Greatest Common Divisior

We found the divisors of 420, 136, 637, 665 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 420, 136, 637, 665 is 1.

Therefore, GCD of numbers 420, 136, 637, 665 is 1

Given Input Data is 420, 136, 637, 665

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

Prime Factorization of 420 is 2 x 2 x 3 x 5 x 7

Prime Factorization of 136 is 2 x 2 x 2 x 17

Prime Factorization of 637 is 7 x 7 x 13

Prime Factorization of 665 is 5 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(420, 136) = 14280

GCD(420, 136) = ( 420 x 136 ) / 14280

GCD(420, 136) = 57120 / 14280

GCD(420, 136) = 4

Step2:

Here we consider the GCD from the above i.e. 4 as first number and the next as 637

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

LCM(4, 637) = 2548

GCD(4, 637) = ( 4 x 637 ) / 2548

GCD(4, 637) = 2548 / 2548

GCD(4, 637) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 665

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

LCM(1, 665) = 665

GCD(1, 665) = ( 1 x 665 ) / 665

GCD(1, 665) = 665 / 665

GCD(1, 665) = 1

GCD of 420, 136, 637, 665 is 1

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1. What is the GCD of 420, 136, 637, 665?

GCD of 420, 136, 637, 665 is 1

2. Where do I get the detailed procedure to find GCD of 420, 136, 637, 665?

You can find a detailed procedure to find GCD of 420, 136, 637, 665 on our page.

3. How to find GCD of 420, 136, 637, 665 on a calculator?

You can find the GCD of 420, 136, 637, 665 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.