Other than the number 1, there are no common factors of these two numbers.
There cannot be a common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36
The common factors of 18 and 36 are 18,9,6,3,2,1.
You need at least two numbers to find a GCF. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36. For them to be common, they need to be compared to another set of factors.
The common factors of 27 and 36 are 1, 3 and 9.
The common factors of 15 and 36 are: 1, 3.
The common factors of 36 and 40 are 1,2 and 4.
Since 12 is a factor of 36, all of the factors of 12 are common to 36.
The factors of 36 are 1,2,3,4,6,9,12,18 and 36. For them to be common, they need to be compared to another set of factors.
The common factors of 21 and 36 are 1 and 3
The common factors of 36 and 63 are 1, 3 and 9
The common factors of 36 and 80 are: 1, 2, and 4