9 is the highest integer which will divide into 36 and 81 a whole number of times (assuming this is what you actually want to know).
36 = 9 * 4
81 = 9 * 9
Of course, we could also answer this specific question with "1" or "3" also.
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36 and 45 = 81.
25, 36, 49, 64, 81
The only number in that list which is not a square number is 27. 27 is a cube number.
In order to answer this: 81x = 36 ;; x = 36/81. You can simplify this by a factor of 9 and you get 4/9.
gcf(81, 36) = 9 gcf(27, 54) = 27 gcf(81, 36, 27, 54) = 9