Just 1.
The only factor 22 and 27 have in common is 1.
What are the common factors for 14 and 22
27 is a prime number. So it's factors are 1 and 27. 22 factors are 1, 2, and 11. So, the highest common factor of 22 and 27 is 1.
The common factors of 27 and 36 are 1, 3 and 9.
The factors of 27 are 1, 3, 9, 27 For them to be common, they need to be compared to another set of factors.
The common factors are: 1, 3, 9, 27
1 & 3 are the common factors of 27 and 33.
The common factors of 27 and 93 are: 1 and 3
The common factors of 27 and 96 are 1 and 3
The common factors of 27 and 57 are 1 and 3
The common factors of 27 and 39 are 1 and 3
Common factors of 87 and 27 are: 1 and 3.