The common factors of 18 and 36 are 18,9,6,3,2,1.
The factors of 17 are 1 and 17. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The common factor is 1. There is only one common factor.
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 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
Since 9 is a factor of 36, all of its factors are common.
The common factors of 36 and 99 are: 1, 3, 9
The common factors of 36 and 81 are: 1, 3, and 9