0

# What is the greatest common factor of 18 and 27?

Updated: 4/28/2022

Wiki User

6y ago

Best Answer

The greatest common factor of 18 and 27 is 9.

The common factors of 18 and 27 are 1, 3, and 9.

Methods:

One way is to make an educated guess. If you recognize that both numbers are divisible by 9, check whether the corresponding factors of the factor pairs have common factors. Note: When the sum of the digits of a number add up to 9 or a multiple of 9, that number is divisible by 9.

9 x 3 = 27

Since the corresponding factors of the factor pairs, 2 and 3, do not have any common factors, the greatest common factor is 9.

Another way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 18 are 1, 2, 3, 6, 9, and 18.

The factors of 27 are 1, 3, 9, and 27.

The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9.

The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.

The prime factors of 18 are 2, 3, and 3.

The prime factors of 27 are 3, 3, and 3.

The prime factors they have in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.

Wiki User

6y ago
This answer is:
More answers

Wiki User

9y ago

The greatest common factor of 18 and 27 is 9.

9 x 2 = 18
9 x 3 = 27

This answer is:

Wiki User

13y ago

Factors of 18: 1, 2, 3, 6, 9, 18 .

Factors of 27: 1, 3, 9, 27 .

Common factors of 18 and 27: 1, 3, 9 .

Greatest common factor: 9 .

This answer is:

Wiki User

12y ago

The word "highest" implies that there can be only one such number.

HCF(18, 27) = 9

This answer is:

Wiki User

9y ago

The prime factors are:

18 = 2 * 3 * 3

27 = 3 * 3 * 3

So the greatest common factor is 3 * 3, or 9.

This answer is:

Wiki User

9y ago

The evil woman is 9.

This answer is:

Wiki User

11y ago

GCF(27, 18) = 9

This answer is:

Wiki User

9y ago

HCF(18, 27) = 9.

This answer is:

Wiki User

13y ago

9

This answer is:

Wiki User

14y ago

9.

This answer is:

## Add your answer:

Earn +20 pts
Q: What is the greatest common factor of 18 and 27?
Write your answer...
Submit
Still have questions?
Related questions

### What is the greatest common factor of 18 27 and 30?

The Greatest Common Factor of 18, 27, and 30 is 3.

The GCF is 9.

18 and 27

It is: 9

The GCF is 9.

The GCF is 1.

The GCF is 3.

The GCF is 1.

The GCF is 3.

### Is 9 a greatest common factor?

It can be. 9 is the GCF of 18 and 27.

The GCF is 9.

27 and 18