GCD of 18, 42, 70, 65 Calculator

Given Input numbers are 18, 42, 70, 65

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 42

List of positive integer divisors of 42 that divides 42 without a remainder.

1, 2, 3, 6, 7, 14, 21, 42

Divisors of 70

List of positive integer divisors of 70 that divides 70 without a remainder.

1, 2, 5, 7, 10, 14, 35, 70

Divisors of 65

List of positive integer divisors of 65 that divides 65 without a remainder.

1, 5, 13, 65

Greatest Common Divisior

We found the divisors of 18, 42, 70, 65 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 18, 42, 70, 65 is 1.

Therefore, GCD of numbers 18, 42, 70, 65 is 1

Given Input Data is 18, 42, 70, 65

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 42 is 2 x 3 x 7

Prime Factorization of 70 is 2 x 5 x 7

Prime Factorization of 65 is 5 x 13

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, 42) = 126

GCD(18, 42) = ( 18 x 42 ) / 126

GCD(18, 42) = 756 / 126

GCD(18, 42) = 6

Step2:

Here we consider the GCD from the above i.e. 6 as first number and the next as 70

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

LCM(6, 70) = 210

GCD(6, 70) = ( 6 x 70 ) / 210

GCD(6, 70) = 420 / 210

GCD(6, 70) = 2

Step3:

Here we consider the GCD from the above i.e. 2 as first number and the next as 65

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

LCM(2, 65) = 130

GCD(2, 65) = ( 2 x 65 ) / 130

GCD(2, 65) = 130 / 130

GCD(2, 65) = 1

GCD of 18, 42, 70, 65 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 18, 42, 87, 81
• GCD of 85, 78, 24, 36
• GCD of 10, 31, 88, 70
• GCD of 50, 52, 75, 75
• GCD of 24, 46, 65, 70

1. What is the GCD of 18, 42, 70, 65?

GCD of 18, 42, 70, 65 is 1

2. Where do I get the detailed procedure to find GCD of 18, 42, 70, 65?

You can find a detailed procedure to find GCD of 18, 42, 70, 65 on our page.

3. How to find GCD of 18, 42, 70, 65 on a calculator?

You can find the GCD of 18, 42, 70, 65 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.