GCD of 645, 661, 87, 644 Calculator

Given Input numbers are 645, 661, 87, 644

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

Divisors of 645

List of positive integer divisors of 645 that divides 645 without a remainder.

1, 3, 5, 15, 43, 129, 215, 645

Divisors of 661

List of positive integer divisors of 661 that divides 661 without a remainder.

1, 661

Divisors of 87

List of positive integer divisors of 87 that divides 87 without a remainder.

1, 3, 29, 87

Divisors of 644

List of positive integer divisors of 644 that divides 644 without a remainder.

1, 2, 4, 7, 14, 23, 28, 46, 92, 161, 322, 644

Greatest Common Divisior

We found the divisors of 645, 661, 87, 644 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 645, 661, 87, 644 is 1.

Therefore, GCD of numbers 645, 661, 87, 644 is 1

Given Input Data is 645, 661, 87, 644

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

Prime Factorization of 645 is 3 x 5 x 43

Prime Factorization of 661 is 661

Prime Factorization of 87 is 3 x 29

Prime Factorization of 644 is 2 x 2 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(645, 661) = 426345

GCD(645, 661) = ( 645 x 661 ) / 426345

GCD(645, 661) = 426345 / 426345

GCD(645, 661) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 87

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

LCM(1, 87) = 87

GCD(1, 87) = ( 1 x 87 ) / 87

GCD(1, 87) = 87 / 87

GCD(1, 87) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 644

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

LCM(1, 644) = 644

GCD(1, 644) = ( 1 x 644 ) / 644

GCD(1, 644) = 644 / 644

GCD(1, 644) = 1

GCD of 645, 661, 87, 644 is 1

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1. What is the GCD of 645, 661, 87, 644?

GCD of 645, 661, 87, 644 is 1

2. Where do I get the detailed procedure to find GCD of 645, 661, 87, 644?

You can find a detailed procedure to find GCD of 645, 661, 87, 644 on our page.

3. How to find GCD of 645, 661, 87, 644 on a calculator?

You can find the GCD of 645, 661, 87, 644 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.