GCD of 70, 85, 18, 21 Calculator
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023
Online GCD Calculator is useful to find the GCD of 70, 85, 18, 21 quickly. Get the easiest ways to solve the greatest common divisor of 70, 85, 18, 21 i.e 1 in different methods as follows.
Given Input numbers are 70, 85, 18, 21
In the factoring method, we have to find the divisors of all numbers
Divisors of 70 :
The positive integer divisors of 70 that completely divides 70 are.
1, 2, 5, 7, 10, 14, 35, 70
Divisors of 85 :
The positive integer divisors of 85 that completely divides 85 are.
1, 5, 17, 85
Divisors of 18 :
The positive integer divisors of 18 that completely divides 18 are.
1, 2, 3, 6, 9, 18
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 (70, 85, 18, 21) = 1.
Given numbers are 70, 85, 18, 21
The list of prime factors of all numbers are
Prime factors of 70 are 2 x 5 x 7
Prime factors of 85 are 5 x 17
Prime factors of 18 are 2 x 3 x 3
Prime factors of 21 are 3 x 7
The above numbers do not have any common prime factor. So GCD is 1
Steps to Calculate GCD of 70, 85, 18, 21 using LCM Formula
Given numbers are 70, 85, 18, 21
GCD of 2 numbers formula is GCD(a, b) = ( a x b) / LCM(a, b)
Apply this formula for all numbers.
Step1:
LCM(70, 85) = 1190
GCD(70, 85) = ( 70 x 85 ) / 1190
= 70 / 85
= 70
Step2:
LCM(5, 18) = 90
GCD(5, 18) = ( 5 x 18 ) / 90
= 5 / 18
= 5
Step3:
LCM(1, 21) = 21
GCD(1, 21) = ( 1 x 21 ) / 21
= 1 / 21
= 1
So, Greatest Common Divisor of 70, 85, 18, 21 is 1
GCD of Numbers Calculation Examples
Here are some samples of GCD of Numbers calculations.
Greatest Common Divisor of 70, 85, 18, 21
Given numbers are 70, 85, 18, 21
The greatest common divisor of numbers 70, 85, 18, 21 can be found in various methods such as the LCM formula, factoring, and prime factorization. The GCD of numbers 70, 85, 18, 21 is 1.
FAQs on GCD of 70, 85, 18, 21 Calculator
1. What is the GCD of 70, 85, 18, 21?
GCD of given numbers 70, 85, 18, 21 is 1
2. How to calculate the greatest common divisor of 70, 85, 18, 21?
We can find the highest common divisor of 70, 85, 18, 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 70, 85, 18, 21 i.e 1.
3. How can I use the GCD of 70, 85, 18, 21Calculator?
Out the numbers 70, 85, 18, 21 into the GCD calculator and hit the calculate button to get the greatest common divisor as result.