Answer:
4/9
Explanation:
To simplify this fraction, we can find the factors for each number and then take an equal amount out (divide).
Two factors that make up 36 are 4 and 9. Two factors that make up 81 are 9 and 9. Therefore, because 9 is a common factor between the two, we can divide both terms by 9 and simplify the fraction.
36/9 = 4
81/9 = 9
The new fraction is 4/9.