The only factor 22 and 27 have in common is 1.
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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.
25, 27, and 45 share no common factors aside from 1.
The common factors of 27 and 30 are 1, 3, and 9.
The common factors are: 1, 2
Factors of 22 are 1,2,11 and 22 Factors of 74 are 1,2,37 and 74 Therefore the highest common factor is 2