Greatest Common Factor of 18 and 31

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 18, 31 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 18 and 31 is 1.

GCF(18,31) = 1

GCF of 18 and 31

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

GCF of:
and

Greatest Common Factor of 18 and 31

GCF of 18 and 31 is 1

Prime Factorization of 18


2 18
3 9
3 3
1

Prime factors of 18 are 2,3. Prime factorization of 18 in exponential form is:

18 = 21×32

Prime Factorization of 31


31 31
1

Prime factors of 31 are 31. Prime factorization of 31 in exponential form is:

31 = 311

∴ So by taking common prime factors GCF of 18 and 31 is 1

Greatest Common Factor of 18 and 31 by matching factors method

Factors of 18

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

1,2,3,6,9,18

Factors of 31

List of positive integer factors of 31 that divides 31 without a remainder.

1,31

Greatest Common Factor

We found the factors and prime factorization of 18 and 31. The biggest common factor number is the GCF number.
So the greatest common factor 18 and 31 is 1.

Also check out the Least Common Multiple of 18 and 31

Properties of GCF 18 and 31

(i) The GCF of 18 and 31 is associative

GCF of 18 and 31 = GCF of 31 and 18

Related Greatest Common Factor of 18

Related Greatest Common Factor of 31

Frequently Asked Questions on GCF of 18 and 31

1. What is the GCF of 18 and 31?

Answer: GCF of 18 and 31 is 1.

2. 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.

3. What are the Factors of 31?

Answer: Factors of 31 are 1, 31. There are 2 integers that are factors of 31. The greatest factor of 31 is 31.

4. How to Find the GCF of 18 and 31?

Answer:

Greatest Common Factor of 18 and 31 = 1

Step 1: Find the prime factorization of 18

18 = 2 x 3 x 3

Step 2: Find the prime factorization of 31

31 = 31

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

GCF = = 1

Step 4: Therefore, the greatest common factor of 18 and 31 is 1