Answer:
9
Explanation:
The factors of 9 are: 1, 3, 9
The factors of 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36
The factors of 189 are: 1, 3, 7, 9, 21, 27, 63, 189
Then the greatest common factor is 9.
Glad I could help!!
you can divide all three numbers by 9 and anything bigger than 9 wouldn't divide 9 to a whole
so the answer is 9
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