Calculate each of the following. State your answers as reduced fractions.
a. 89⋅59\displaystyle \frac{{8}}{{9}}\cdot\frac{{5}}{{9}} =  
b. 5⋅89\displaystyle {5}\cdot\frac{{8}}{{9}} =  
c. 89⋅3640\displaystyle \frac{{8}}{{9}}\cdot\frac{{36}}{{40}} =  

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