GCD of 639, 843, 21 Calculator
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023
Online GCD Calculator is useful to find the GCD of 639, 843, 21 quickly. Get the easiest ways to solve the greatest common divisor of 639, 843, 21 i.e 3 in different methods as follows.
Given Input numbers are 639, 843, 21
In the factoring method, we have to find the divisors of all numbers
Divisors of 639 :
The positive integer divisors of 639 that completely divides 639 are.
1, 3, 9, 71, 213, 639
Divisors of 843 :
The positive integer divisors of 843 that completely divides 843 are.
1, 3, 281, 843
Divisors of 21 :
The positive integer divisors of 21 that completely divides 21 are.
1, 3, 7, 21
GCD of numbers is the greatest common divisor
So, the GCD (639, 843, 21) = 3.
Given numbers are 639, 843, 21
The list of prime factors of all numbers are
Prime factors of 639 are 3 x 3 x 71
Prime factors of 843 are 3 x 281
Prime factors of 21 are 3 x 7
The highest common occurrence is 31
Therefore, GCD of 639, 843, 21 is 3.
Steps to Calculate GCD of 639, 843, 21 using LCM Formula
Given numbers are 639, 843, 21
GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)
Apply this formula for all numbers.
Step1:
LCM(639, 843) = 179559
GCD(639, 843) = ( 639 x 843 ) / 179559
= 639 / 843
= 639
Step2:
LCM(3, 21) = 21
GCD(3, 21) = ( 3 x 21 ) / 21
= 3 / 21
= 3
So, Greatest Common Divisor of 639, 843, 21 is 3
GCD of Numbers Calculation Examples
Here are some samples of GCD of Numbers calculations.
Greatest Common Divisor of 639, 843, 21
Given numbers are 639, 843, 21
The greatest common divisor of numbers 639, 843, 21 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 639, 843, 21 is 3.
FAQs on GCD of 639, 843, 21 Calculator
1. What is the GCD of 639, 843, 21?
GCD of given numbers 639, 843, 21 is 3
2. How to calculate the greatest common divisor of 639, 843, 21?
We can find the highest common divisor of 639, 843, 21 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 639, 843, 21 i.e 3.
3. How can I use the GCD of 639, 843, 21Calculator?
Out the numbers 639, 843, 21 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.