What are the greater common factor of18 and 36?

Answer 1

The Greatest Common Factor depends upon the numbers for which there are common factors and it is the greatest one of them; it can be greater than 18, for example the greatest common factor of 40 and 100 is 20.

The greatest common factor must be one of the factors of each of the numbers. As the factors of each number cannot be greater than that number, the greatest common factor of a set of numbers cannot be greater than the least number. If this number is not greater than 18 then the greatest common factor of the numbers cannot be greater than 18.

Even if the least number is greater than 18 it is possible that the greatest common factor of a set of numbers is still not greater than 18, for example the greatest common factor of 20, 30 and 50 is 10.

Answer 2

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

The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36.

The common factors are: 1, 2, 3, 6, 9, 18.

The Greatest Common Factor (GCF) is: 18

Answer 3

Factors of 18 are 1, 2, 3, 6, 9, 18

Factors of 36 are 1, 2, 3, 4, 6, 9, 12. 18, 36

Factors that 18 and 36 have in common are 1, 2, 3, 9, 18

The greatest factor they have in common is 18

Answer 4

No. 18 cannot have a factor higher than itself, so the pair cannot have a common factor higher than 18.

Answer 5

The Greatest Common Factor of 36 and 72 is 36.

Answer 6

Since 18 is a factor of 36, it is automatically the GCF.

Answer 7

9