GCD of 18, 661, 455, 521 Calculator

Given Input numbers are 18, 661, 455, 521

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

Divisors of 18

List of positive integer divisors of 18 that divides 18 without a remainder.

1, 2, 3, 6, 9, 18

Divisors of 661

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

1, 661

Divisors of 455

List of positive integer divisors of 455 that divides 455 without a remainder.

1, 5, 7, 13, 35, 65, 91, 455

Divisors of 521

List of positive integer divisors of 521 that divides 521 without a remainder.

1, 521

Greatest Common Divisior

We found the divisors of 18, 661, 455, 521 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 18, 661, 455, 521 is 1.

Therefore, GCD of numbers 18, 661, 455, 521 is 1

Given Input Data is 18, 661, 455, 521

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

Prime Factorization of 18 is 2 x 3 x 3

Prime Factorization of 661 is 661

Prime Factorization of 455 is 5 x 7 x 13

Prime Factorization of 521 is 521

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(18, 661) = 11898

GCD(18, 661) = ( 18 x 661 ) / 11898

GCD(18, 661) = 11898 / 11898

GCD(18, 661) = 1

Step2:

Here we consider the GCD from the above i.e. 1 as first number and the next as 455

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

LCM(1, 455) = 455

GCD(1, 455) = ( 1 x 455 ) / 455

GCD(1, 455) = 455 / 455

GCD(1, 455) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 521

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

LCM(1, 521) = 521

GCD(1, 521) = ( 1 x 521 ) / 521

GCD(1, 521) = 521 / 521

GCD(1, 521) = 1

GCD of 18, 661, 455, 521 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 62, 687, 158, 833
• GCD of 76, 918, 118, 735
• GCD of 90, 169, 841, 754
• GCD of 66, 736, 637, 642
• GCD of 20, 925, 920, 448

1. What is the GCD of 18, 661, 455, 521?

GCD of 18, 661, 455, 521 is 1

2. Where do I get the detailed procedure to find GCD of 18, 661, 455, 521?

You can find a detailed procedure to find GCD of 18, 661, 455, 521 on our page.

3. How to find GCD of 18, 661, 455, 521 on a calculator?

You can find the GCD of 18, 661, 455, 521 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.