Online GCD Calculator is useful to find the GCD of 855, 390, 561, 445 quickly. Get the easiest ways to solve the greatest common divisor of 855, 390, 561, 445 i.e 1 in different methods as follows.
Given Input numbers are 855, 390, 561, 445
In the factoring method, we have to find the divisors of all numbers
Divisors of 855 :
The positive integer divisors of 855 that completely divides 855 are.
1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855
Divisors of 390 :
The positive integer divisors of 390 that completely divides 390 are.
1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390
Divisors of 561 :
The positive integer divisors of 561 that completely divides 561 are.
1, 3, 11, 17, 33, 51, 187, 561
Divisors of 445 :
The positive integer divisors of 445 that completely divides 445 are.
1, 5, 89, 445
GCD of numbers is the greatest common divisor
So, the GCD (855, 390, 561, 445) = 1.
Given numbers are 855, 390, 561, 445
The list of prime factors of all numbers are
Prime factors of 855 are 3 x 3 x 5 x 19
Prime factors of 390 are 2 x 3 x 5 x 13
Prime factors of 561 are 3 x 11 x 17
Prime factors of 445 are 5 x 89
The above numbers do not have any common prime factor. So GCD is 1
Given numbers are 855, 390, 561, 445
GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)
Apply this formula for all numbers.
Step1:
LCM(855, 390) = 22230
GCD(855, 390) = ( 855 x 390 ) / 22230
= 855 / 390
= 855
Step2:
LCM(15, 561) = 2805
GCD(15, 561) = ( 15 x 561 ) / 2805
= 15 / 561
= 15
Step3:
LCM(3, 445) = 1335
GCD(3, 445) = ( 3 x 445 ) / 1335
= 3 / 445
= 3
So, Greatest Common Divisor of 855, 390, 561, 445 is 1
Here are some samples of GCD of Numbers calculations.
Given numbers are 855, 390, 561, 445
The greatest common divisor of numbers 855, 390, 561, 445 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 855, 390, 561, 445 is 1.
1. What is the GCD of 855, 390, 561, 445?
GCD of given numbers 855, 390, 561, 445 is 1
2. How to calculate the greatest common divisor of 855, 390, 561, 445?
We can find the highest common divisor of 855, 390, 561, 445 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 855, 390, 561, 445 i.e 1.
3. How can I use the GCD of 855, 390, 561, 445Calculator?
Out the numbers 855, 390, 561, 445 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.