1414| $11 - 9$ | $11 - 8$ | $11 - 7$ | $11 - 6$ | $11 - 5$ | $11 - 4$ | $11 - 3$ | $11 - 2$ |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| $12 - 9$ | | | | | | | |
| $13 - 9$ | | | | | | | |
| $14 - 9$ | | | | | | | |
| $15 - 9$ | | | | | | | |
| $16 - 9$ | | | | | | | |
| $17 - 9$ | | | | | | | |
| $18 - 9$ | | | | | | | |
$\begin{array}{|c|}\hline7+ 8 = \\15- 7 = \\15- 8 = \\\hline\end{array}$
$\begin{array}{|c|}\hline7+ 5 = \\12- 7 = \\12- 5 = \\\hline\end{array}$
$\begin{array}{|c|}\hline6+ 5 = \\11- 6 = \\11- 5 = \\\hline\end{array}$
$\begin{array}{|c|}\hline8+ 9 = \\17- 8 = \\17- 9 = \\\hline\end{array}$
$\begin{array}{|c|}\hline6+ 9 = \\15- 6 = \\15- 9 = \\\hline\end{array}$
$\begin{array}{|c|}\hline4+ 9 = \\13- 9 = \\13- 4 = \\\hline\end{array}$
$\begin{array}{|c|}\hline7+ 9 = \\16- 7 = \\16- 9 = \\\hline\end{array}$
$\begin{array}{|c|}\hline9+ 5 = \\14- 9 = \\14- 5 = \\\hline\end{array}$
$\begin{array}{|c|}\hline3+ 8 = \\11- 3 = \\11- 8 = \\\hline\end{array}$

| $11 - 9$ | $11 - 8$ | $11 - 7$ | $11 - 6$ | $11 - 5$ | $11 - 4$ | $11 - 3$ | $11 - 2$ |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| $2$ | $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ |
| $12 - 9$ | $12 - 8$ | $12 - 7$ | $12 - 6$ | $12 - 5$ | $12 - 4$ | $12 - 3$ | $12 - 2$ |
| $3$ | $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ |
| $13 - 9$ | $13 - 8$ | $13 - 7$ | $13 - 6$ | $13 - 5$ | $13 - 4$ | $13 - 3$ | $13 - 2$ |
| $4$ | $5$ | $6$ | $7$ | $8$ | $9$ | $10$ | $11$ |
| $14 - 9$ | $14 - 8$ | $14 - 7$ | $14 - 6$ | $14 - 5$ | $14 - 4$ | $14 - 3$ | $14 - 2$ |
| $5$ | $6$ | $7$ | $8$ | $9$ | $10$ | $11$ | $12$ |
| $15 - 9$ | $15 - 8$ | $15 - 7$ | $15 - 6$ | $15 - 5$ | $15 - 4$ | $15 - 3$ | $15 - 2$ |
| $6$ | $7$ | $8$ | $9$ | $10$ | $11$ | $12$ | $13$ |
| $16 - 9$ | $16 - 8$ | $16 - 7$ | $16 - 6$ | $16 - 5$ | $16 - 4$ | $16 - 3$ | $16 - 2$ |
| $7$ | $8$ | $9$ | $10$ | $11$ | $12$ | $13$ | $14$ |
| $17 - 9$ | $17 - 8$ | $17 - 7$ | $17 - 6$ | $17 - 5$ | $17 - 4$ | $17 - 3$ | $17 - 2$ |
| $8$ | $9$ | $10$ | $11$ | $12$ | $13$ | $14$ | $15$ |
| $18 - 9$ | $18 - 8$ | $18 - 7$ | $18 - 6$ | $18 - 5$ | $18 - 4$ | $18 - 3$ | $18 - 2$ |
| $9$ | $10$ | $11$ | $12$ | $13$ | $14$ | $15$ | $16$ |
$\begin{array}{|c|}\hline7+ 8 = 15 \\15- 7 = 8 \\15- 8 = 7 \\\hline\end{array}$
$\begin{array}{|c|}\hline7+ 5 = 12 \\12- 7 = 5 \\12- 5 = 7 \\\hline\end{array}$
$\begin{array}{|c|}\hline6+ 5 = 11 \\11- 6 = 5 \\11- 5 = 6 \\\hline\end{array}$
$\begin{array}{|c|}\hline8+ 9 = 17 \\17- 8 = 9 \\17- 9 = 8 \\\hline\end{array}$
$\begin{array}{|c|}\hline6+ 9 = 15 \\15- 6 = 9 \\15- 9 = 6 \\\hline\end{array}$
$\begin{array}{|c|}\hline4+ 9 = 13 \\13- 9 = 4 \\13- 4 = 9 \\\hline\end{array}$
$\begin{array}{|c|}\hline7+ 9 = 16 \\16- 7 = 9 \\16- 9 = 7 \\\hline\end{array}$
$\begin{array}{|c|}\hline9+ 5 = 14 \\14- 9 = 5 \\14- 5 = 9 \\\hline\end{array}$
$\begin{array}{|c|}\hline3+ 8 = 11 \\11- 3 = 8 \\11- 8 = 3 \\\hline\end{array}$