Draw beads on the abacus and add $36$ and $42$.

 

Draw beads on the abcus and add $83$ and $15$.

Draw beads on the abacus and add $75$ and $15$.

Draw beads on the abacus and add $82$ and $11$.

Add the following numbers.

$\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 4& 6\\ +& 3& 9\\ & & \end{array}$

Add the following.

$\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 6& 4\\ +& 2& 6\\ & & \end{array}$

Add the following numbers.

$\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 4& 6\\ +& 3& 5\\ & & \end{array}$

Add the following numbers.

$\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 6& 3\\ +& 2& 7\\ & & \end{array}$

Add the following.

$\begin{array}{ccc}& \mathrm{T}& \mathrm{O}\\ & 5& 4\\ & 4& 5\\ +& 2& 9\\ & & \end{array}$