\[\boxed{\mathbf{34.}}\]
\[2 \cdot 3 = 6\]
\[6\ :2 = 3\]
\[6\ :3 = 2\]
\[2 \cdot 6 = 12\]
\[12\ :6 = 2\]
\[12\ :2 = 6\]
\[3 \cdot 4 = 12\]
\[12\ :3 = 4\]
\[12\ :4 = 3\]
\[3 \cdot 5 = 15\]
\[15\ :3 = 5\]
\[15\ :5 = 3\]
\[4 \cdot 2 = 8\]
\[8\ :4 = 2\]
\[8\ :2 = 4\]
\[4 \cdot 5 = 20\]
\[20\ :4 = 5\]
\[20\ :5 = 4\]
\[5 \cdot 2 = 10\]
\[10\ :5 = 2\]
\[10\ :2 = 5\]
\[6 \cdot 3 = 18\]
\[18\ :6 = 3\]
\[18\ :3 = 6\]