GCD of 15, 28, 20, 89 Calculator

Given Input numbers are 15, 28, 20, 89

In the factoring method, we have to find the divisors of all numbers

Divisors of 15 :

The positive integer divisors of 15 that completely divides 15 are.

1, 3, 5, 15

Divisors of 28 :

The positive integer divisors of 28 that completely divides 28 are.

1, 2, 4, 7, 14, 28

Divisors of 20 :

The positive integer divisors of 20 that completely divides 20 are.

1, 2, 4, 5, 10, 20

Divisors of 89 :

The positive integer divisors of 89 that completely divides 89 are.

1, 89

GCD of numbers is the greatest common divisor

So, the GCD (15, 28, 20, 89) = 1.

Given numbers are 15, 28, 20, 89

The list of prime factors of all numbers are

Prime factors of 15 are 3 x 5

Prime factors of 28 are 2 x 2 x 7

Prime factors of 20 are 2 x 2 x 5

Prime factors of 89 are 89

The above numbers do not have any common prime factor. So GCD is 1

Given numbers are 15, 28, 20, 89

GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)

Apply this formula for all numbers.

Step1:

LCM(15, 28) = 420

GCD(15, 28) = ( 15 x 28 ) / 420

= 15 / 28

= 15

Step2:

LCM(1, 20) = 20

GCD(1, 20) = ( 1 x 20 ) / 20

= 1 / 20

= 1

Step3:

LCM(1, 89) = 89

GCD(1, 89) = ( 1 x 89 ) / 89

= 1 / 89

= 1

So, Greatest Common Divisor of 15, 28, 20, 89 is 1

Here are some samples of GCD of Numbers calculations.

• GCD of 65, 23, 87, 37
• GCD of 19, 28, 79, 11
• GCD of 12, 10, 34, 90
• GCD of 47, 79, 51, 20
• GCD of 77, 85, 45, 32

Given numbers are 15, 28, 20, 89
The greatest common divisor of numbers 15, 28, 20, 89 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 15, 28, 20, 89 is 1.

1. What is the GCD of 15, 28, 20, 89?

GCD of given numbers 15, 28, 20, 89 is 1

2. How to calculate the greatest common divisor of 15, 28, 20, 89?

We can find the highest common divisor of 15, 28, 20, 89 easily using the prime factorization method. Just list the prime factors of all numbers and pick the highest common factor which is the GCD of 15, 28, 20, 89 i.e 1.

3. How can I use the GCD of 15, 28, 20, 89Calculator?

Out the numbers 15, 28, 20, 89 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.