GCD of 57, 21, 18, 51 Calculator

Given Input numbers are 57, 21, 18, 51

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

Divisors of 57

List of positive integer divisors of 57 that divides 57 without a remainder.

1, 3, 19, 57

Divisors of 21

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

1, 3, 7, 21

Divisors of 18

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

1, 2, 3, 6, 9, 18

Divisors of 51

List of positive integer divisors of 51 that divides 51 without a remainder.

1, 3, 17, 51

Greatest Common Divisior

We found the divisors of 57, 21, 18, 51 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 57, 21, 18, 51 is 3.

Therefore, GCD of numbers 57, 21, 18, 51 is 3

Given Input Data is 57, 21, 18, 51

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

Prime Factorization of 57 is 3 x 19

Prime Factorization of 21 is 3 x 7

Prime Factorization of 18 is 2 x 3 x 3

Prime Factorization of 51 is 3 x 17

Highest common occurrences in the given inputs are 3¹

Multiplying them we get the GCD as 3

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(57, 21) = 399

GCD(57, 21) = ( 57 x 21 ) / 399

GCD(57, 21) = 1197 / 399

GCD(57, 21) = 3

Step2:

Here we consider the GCD from the above i.e. 3 as first number and the next as 18

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

LCM(3, 18) = 18

GCD(3, 18) = ( 3 x 18 ) / 18

GCD(3, 18) = 54 / 18

GCD(3, 18) = 3

Step3:

Here we consider the GCD from the above i.e. 3 as first number and the next as 51

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

LCM(3, 51) = 51

GCD(3, 51) = ( 3 x 51 ) / 51

GCD(3, 51) = 153 / 51

GCD(3, 51) = 3

GCD of 57, 21, 18, 51 is 3

Here are some samples of GCD of Numbers calculations.

• GCD of 99, 11, 77, 63
• GCD of 94, 67, 96, 86
• GCD of 64, 73, 58, 31
• GCD of 25, 50, 98, 60
• GCD of 65, 86, 98, 15

1. What is the GCD of 57, 21, 18, 51?

GCD of 57, 21, 18, 51 is 3

2. Where do I get the detailed procedure to find GCD of 57, 21, 18, 51?

You can find a detailed procedure to find GCD of 57, 21, 18, 51 on our page.

3. How to find GCD of 57, 21, 18, 51 on a calculator?

You can find the GCD of 57, 21, 18, 51 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.