GCD of 15, 90, 39, 71 Calculator

Given Input numbers are 15, 90, 39, 71

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

Divisors of 15

List of positive integer divisors of 15 that divides 15 without a remainder.

1, 3, 5, 15

Divisors of 90

List of positive integer divisors of 90 that divides 90 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

Divisors of 39

List of positive integer divisors of 39 that divides 39 without a remainder.

1, 3, 13, 39

Divisors of 71

List of positive integer divisors of 71 that divides 71 without a remainder.

1, 71

Greatest Common Divisior

We found the divisors of 15, 90, 39, 71 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 15, 90, 39, 71 is 1.

Therefore, GCD of numbers 15, 90, 39, 71 is 1

Given Input Data is 15, 90, 39, 71

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

Prime Factorization of 15 is 3 x 5

Prime Factorization of 90 is 2 x 3 x 3 x 5

Prime Factorization of 39 is 3 x 13

Prime Factorization of 71 is 71

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(15, 90) = 90

GCD(15, 90) = ( 15 x 90 ) / 90

GCD(15, 90) = 1350 / 90

GCD(15, 90) = 15

Step2:

Here we consider the GCD from the above i.e. 15 as first number and the next as 39

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

LCM(15, 39) = 195

GCD(15, 39) = ( 15 x 39 ) / 195

GCD(15, 39) = 585 / 195

GCD(15, 39) = 3

Step3:

Here we consider the GCD from the above i.e. 3 as first number and the next as 71

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

LCM(3, 71) = 213

GCD(3, 71) = ( 3 x 71 ) / 213

GCD(3, 71) = 213 / 213

GCD(3, 71) = 1

GCD of 15, 90, 39, 71 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 55, 50, 29, 92
• GCD of 87, 15, 64, 12
• GCD of 53, 89, 54, 14
• GCD of 37, 25, 27, 61
• GCD of 12, 36, 62, 24

1. What is the GCD of 15, 90, 39, 71?

GCD of 15, 90, 39, 71 is 1

2. Where do I get the detailed procedure to find GCD of 15, 90, 39, 71?

You can find a detailed procedure to find GCD of 15, 90, 39, 71 on our page.

3. How to find GCD of 15, 90, 39, 71 on a calculator?

You can find the GCD of 15, 90, 39, 71 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.