Solve the following.

$9\times$ _____ $=81$

Add as needed.

$\underline{\begin{array}{ccccc}& \mathrm{L}& & \mathrm{mL}& \\ & 6& 6& 2& 3\\ +& 1& 2& 4& 1\end{array}}$

Subtract as needed.

$$$\underline{\begin{array}{ccccccc}& \mathrm{kg}& & & \mathrm{g}& & \\ & 8& 7& & 5& 8& 9\\ -& 7& 2& & 3& 0& 9\end{array}}$
 

Add as needed:

$\begin{array}{ccc}& \mathrm{m}& \mathrm{cm}\\ & 6& 88\\ +& 3& 45\\ & & \end{array}$ 

Add:

$\begin{array}{ccccc}& \mathrm{L}& & \mathrm{ml}& \\ & 9& .& 5& 8\\ +& 3& .& 2& 5\\ & & & & \end{array}$

Add:

$\begin{array}{cccc}& 8& 8& 8\\ +& 3& 4& 3\\ & & & \end{array}$

Add.

$\begin{array}{ccc}& 4& 5\\ +& 3& 9\\ & & \end{array}$

Add:

$\underline{\begin{array}{cccc}& 3& 4& 5\\ +& 1& 8& 6\end{array}}$

Add.

$\underline{\begin{array}{cccc}& 7& 4& 5\\ +& 2& 8& 8\end{array}}$