Greatest Common Factor of 400 and 405

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 400, 405 i.e. 5 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 400 and 405 is 5.

GCF(400,405) = 5

GCF of 400 and 405

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 400 and 405

GCF of 400 and 405 is 5

Prime Factorization of 400


2 400
2 200
2 100
2 50
5 25
5 5
1

Prime factors of 400 are 2,5. Prime factorization of 400 in exponential form is:

400 = 24×52

Prime Factorization of 405


3 405
3 135
3 45
3 15
5 5
1

Prime factors of 405 are 3,5. Prime factorization of 405 in exponential form is:

405 = 34×51

∴ So by taking common prime factors GCF of 400 and 405 is 5

Greatest Common Factor of 400 and 405 by matching factors method

Factors of 400

List of positive integer factors of 400 that divides 400 without a remainder.

1,2,4,5,8,10,16,20,25,40,50,80,100,200,400

Factors of 405

List of positive integer factors of 405 that divides 405 without a remainder.

1,3,5,9,15,27,45,81,135,405

Greatest Common Factor

We found the factors and prime factorization of 400 and 405. The biggest common factor number is the GCF number.
So the greatest common factor 400 and 405 is 5.

Also check out the Least Common Multiple of 400 and 405

Properties of GCF 400 and 405

(i) The GCF of 400 and 405 is associative

GCF of 400 and 405 = GCF of 405 and 400

Related Greatest Common Factor of 400

Related Greatest Common Factor of 405

Frequently Asked Questions on GCF of 400 and 405

1. What is the GCF of 400 and 405?

Answer: GCF of 400 and 405 is 5.

2. What are the Factors of 400?

Answer: Factors of 400 are 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400. There are 15 integers that are factors of 400. The greatest factor of 400 is 400.

3. What are the Factors of 405?

Answer: Factors of 405 are 1, 3, 5, 9, 15, 27, 45, 81, 135, 405. There are 10 integers that are factors of 405. The greatest factor of 405 is 405.

4. How to Find the GCF of 400 and 405?

Answer:

Greatest Common Factor of 400 and 405 = 5

Step 1: Find the prime factorization of 400

400 = 2 x 2 x 2 x 2 x 5 x 5

Step 2: Find the prime factorization of 405

405 = 3 x 3 x 3 x 3 x 5

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = 5

Step 4: Therefore, the greatest common factor of 400 and 405 is 5