GCD of 490, 645, 249, 128 Calculator

Given Input numbers are 490, 645, 249, 128

To find the GCD of numbers using factoring list out all the divisors of each number

Divisors of 490

List of positive integer divisors of 490 that divides 490 without a remainder.

1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490

Divisors of 645

List of positive integer divisors of 645 that divides 645 without a remainder.

1, 3, 5, 15, 43, 129, 215, 645

Divisors of 249

List of positive integer divisors of 249 that divides 249 without a remainder.

1, 3, 83, 249

Divisors of 128

List of positive integer divisors of 128 that divides 128 without a remainder.

1, 2, 4, 8, 16, 32, 64, 128

Greatest Common Divisior

We found the divisors of 490, 645, 249, 128 . The biggest common divisior number is the GCD number.
So the Greatest Common Divisior 490, 645, 249, 128 is 1.

Therefore, GCD of numbers 490, 645, 249, 128 is 1

Given Input Data is 490, 645, 249, 128

Make a list of Prime Factors of all the given numbers initially

Prime Factorization of 490 is 2 x 5 x 7 x 7

Prime Factorization of 645 is 3 x 5 x 43

Prime Factorization of 249 is 3 x 83

Prime Factorization of 128 is 2 x 2 x 2 x 2 x 2 x 2 x 2

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

Step1:

Let's calculate the GCD of first two numbers

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

LCM(490, 645) = 63210

GCD(490, 645) = ( 490 x 645 ) / 63210

GCD(490, 645) = 316050 / 63210

GCD(490, 645) = 5

Step2:

Here we consider the GCD from the above i.e. 5 as first number and the next as 249

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

LCM(5, 249) = 1245

GCD(5, 249) = ( 5 x 249 ) / 1245

GCD(5, 249) = 1245 / 1245

GCD(5, 249) = 1

Step3:

Here we consider the GCD from the above i.e. 1 as first number and the next as 128

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

LCM(1, 128) = 128

GCD(1, 128) = ( 1 x 128 ) / 128

GCD(1, 128) = 128 / 128

GCD(1, 128) = 1

GCD of 490, 645, 249, 128 is 1

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1. What is the GCD of 490, 645, 249, 128?

GCD of 490, 645, 249, 128 is 1

2. Where do I get the detailed procedure to find GCD of 490, 645, 249, 128?

You can find a detailed procedure to find GCD of 490, 645, 249, 128 on our page.

3. How to find GCD of 490, 645, 249, 128 on a calculator?

You can find the GCD of 490, 645, 249, 128 by simply giving the inputs separated by commas and click on the calculate button to avail the Greatest Common Divisor in less time.