\[81^{- 2} \cdot 27^{2} = \left( 3^{4} \right)^{- 2} \cdot \left( 3^{2} \right)^{2} =\]
\[= 3^{- 8} \cdot 3^{6} = 3^{- 2} = \frac{1}{9}\]