GCD of 155, 981, 21, 654 Calculator

Given Input numbers are 155, 981, 21, 654

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

Divisors of 155

List of positive integer divisors of 155 that divides 155 without a remainder.

1, 5, 31, 155

Divisors of 981

List of positive integer divisors of 981 that divides 981 without a remainder.

1, 3, 9, 109, 327, 981

Divisors of 21

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

1, 3, 7, 21

Divisors of 654

List of positive integer divisors of 654 that divides 654 without a remainder.

1, 2, 3, 6, 109, 218, 327, 654

Greatest Common Divisior

We found the divisors of 155, 981, 21, 654 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 155, 981, 21, 654 is 1.

Therefore, GCD of numbers 155, 981, 21, 654 is 1

Given Input Data is 155, 981, 21, 654

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

Prime Factorization of 155 is 5 x 31

Prime Factorization of 981 is 3 x 3 x 109

Prime Factorization of 21 is 3 x 7

Prime Factorization of 654 is 2 x 3 x 109

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(155, 981) = 152055

GCD(155, 981) = ( 155 x 981 ) / 152055

GCD(155, 981) = 152055 / 152055

GCD(155, 981) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 21

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

LCM(1, 21) = 21

GCD(1, 21) = ( 1 x 21 ) / 21

GCD(1, 21) = 21 / 21

GCD(1, 21) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 654

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

LCM(1, 654) = 654

GCD(1, 654) = ( 1 x 654 ) / 654

GCD(1, 654) = 654 / 654

GCD(1, 654) = 1

GCD of 155, 981, 21, 654 is 1

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1. What is the GCD of 155, 981, 21, 654?

GCD of 155, 981, 21, 654 is 1

2. Where do I get the detailed procedure to find GCD of 155, 981, 21, 654?

You can find a detailed procedure to find GCD of 155, 981, 21, 654 on our page.

3. How to find GCD of 155, 981, 21, 654 on a calculator?

You can find the GCD of 155, 981, 21, 654 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.