GCD of 42, 71, 87, 20 Calculator
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023
Online GCD Calculator is useful to find the GCD of 42, 71, 87, 20 quickly. Get the easiest ways to solve the greatest common divisor of 42, 71, 87, 20 i.e 1 in different methods as follows.
Given Input numbers are 42, 71, 87, 20
In the factoring method, we have to find the divisors of all numbers
Divisors of 42 :
The positive integer divisors of 42 that completely divides 42 are.
1, 2, 3, 6, 7, 14, 21, 42
Divisors of 71 :
The positive integer divisors of 71 that completely divides 71 are.
1, 71
Divisors of 87 :
The positive integer divisors of 87 that completely divides 87 are.
1, 3, 29, 87
Divisors of 20 :
The positive integer divisors of 20 that completely divides 20 are.
1, 2, 4, 5, 10, 20
GCD of numbers is the greatest common divisor
So, the GCD (42, 71, 87, 20) = 1.
Given numbers are 42, 71, 87, 20
The list of prime factors of all numbers are
Prime factors of 42 are 2 x 3 x 7
Prime factors of 71 are 71
Prime factors of 87 are 3 x 29
Prime factors of 20 are 2 x 2 x 5
The above numbers do not have any common prime factor. So GCD is 1
Steps to Calculate GCD of 42, 71, 87, 20 using LCM Formula
Given numbers are 42, 71, 87, 20
GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)
Apply this formula for all numbers.
Step1:
LCM(42, 71) = 2982
GCD(42, 71) = ( 42 x 71 ) / 2982
= 42 / 71
= 42
Step2:
LCM(1, 87) = 87
GCD(1, 87) = ( 1 x 87 ) / 87
= 1 / 87
= 1
Step3:
LCM(1, 20) = 20
GCD(1, 20) = ( 1 x 20 ) / 20
= 1 / 20
= 1
So, Greatest Common Divisor of 42, 71, 87, 20 is 1
GCD of Numbers Calculation Examples
Here are some samples of GCD of Numbers calculations.
Greatest Common Divisor of 42, 71, 87, 20
Given numbers are 42, 71, 87, 20
The greatest common divisor of numbers 42, 71, 87, 20 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 42, 71, 87, 20 is 1.
FAQs on GCD of 42, 71, 87, 20 Calculator
1. What is the GCD of 42, 71, 87, 20?
GCD of given numbers 42, 71, 87, 20 is 1
2. How to calculate the greatest common divisor of 42, 71, 87, 20?
We can find the highest common divisor of 42, 71, 87, 20 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 42, 71, 87, 20 i.e 1.
3. How can I use the GCD of 42, 71, 87, 20Calculator?
Out the numbers 42, 71, 87, 20 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.