&10\\
+\!\!\!\!\!\,&4\\
\hline
\end{array}$
2. $\begin{array}{r}
&12\\
+\!\!\!\!\!\,&6\\
\hline
\end{array}$
3. $\begin{array}{r}
&15\\
+\!\!\!\!\!\,&7\\
\hline
\end{array}$
4. $\begin{array}{r}
&16\\
+\!\!\!\!\!\,&4\\
\hline
\end{array}$
5. $\begin{array}{r}
&18\\
+\!\!\!\!\!\,&5\\
\hline
\end{array}$
6. $\begin{array}{r}
&19\\
+\!\!\!\!\!\,&6\\
\hline
\end{array}$
7. $\begin{array}{r}
&17\\
+\!\!\!\!\!\,&9\\
\hline
\end{array}$
8. $\begin{array}{r}
&18\\
+\!\!\!\!\!\,&8\\
\hline
\end{array}$
9. $\begin{array}{r}
&12\\
+\!\!\!\!\!\,&9\\
\hline
\end{array}$
10. $\begin{array}{r}
&13\\
+\!\!\!\!\!\,&6\\
\hline
\end{array}$