Greatest Common Factor of 9 and 18

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 9, 18 i.e. 9 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 9 and 18 is 9.

GCF(9,18) = 9

GCF of 9 and 18

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

GCF of:
and

Greatest Common Factor of 9 and 18

GCF of 9 and 18 is 9

Prime Factorization of 9


3 9
3 3
1

Prime factors of 9 are 3. Prime factorization of 9 in exponential form is:

9 = 32

Prime Factorization of 18


2 18
3 9
3 3
1

Prime factors of 18 are 2.Prime factorization of 18 in exponential form is:

18 = 21×32

∴ So by taking common prime factors GCF of 9 and 18 is 9

Greatest Common Factor of 9 and 18 by matching factors method

Factors of 9

List of positive integer factors of 9 that divides 9 without a remainder.

1,3,9

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Greatest Common Factor

We found the factors and prime factorization of 9 and 18. The biggest common factor number is the GCF number.
So the greatest common factor 9 and 18 is 9.

Also check out the Least Common Multiple of 9 and 18

Properties of GCF 9 and 18

(i) The GCF of 9 and 18 is associative

GCF of 9 and 18 = GCF of 18 and 9

Related Greatest Common Factor of 9

Related Greatest Common Factor of 18

Frequently Asked Questions on GCF of 9 and 18

1. What is the GCF of 9 and 18?

Answer: GCF of 9 and 18 is 9.

2. What are the Factors of 9?

Answer: Factors of 9 are 1, 3, 9. There are 3 integers that are factors of 9. The greatest factor of 9 is 9.

3. What are the Factors of 18?

Answer: Factors of 18 are 1, 2, 3, 6, 9, 18. There are 6 integers that are factors of 18. The greatest factor of 18 is 18.

4. How to Find the GCF of 9 and 18?

Answer:

Greatest Common Factor of 9 and 18 = 9

Step 1: Find the prime factorization of 9

9 = 3 x 3

Step 2: Find the prime factorization of 18

18 = 2 x 3 x 3

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

GCF = 3 x 3 = 9

Step 4: Therefore, the greatest common factor of 9 and 18 is 9