Answer:
9
Step-by-step explanation:
Simplify before multiplying to make things easier.
[tex]\frac{1}{9}[/tex]* [tex]\frac{81}{1}[/tex]
you can cross-simplify 9 and 81, which simplifies to:
[tex]\frac{1}{1}[/tex]*[tex]\frac{9}{1}[/tex]
[tex]\frac{1}{1}[/tex] is equivalent to 1 and [tex]\frac{9}{1}[/tex] is equivalent to 9, so all you're really doing is multiplying 9*1
9*1 = 9
so 1/9 * 81/1 is just 9.
