\[\boxed{\mathbf{466.}}\]
\[\textbf{а)}\ 150\ :3 = 50\]
\[210\ :7 = 30\]
\[450\ :5 = 90\]
\[50 \cdot 6 = 300\]
\[480\ :8 = 60\]
\[4 \cdot 70 = 280\]
\[\textbf{б)}\ 90 \cdot 2\ :6 = 180\ :6 = 30\]
\[8 \cdot 30\ :4 = 240\ :4 = 60\]
\[810\ :9 \cdot 7 = 90 \cdot 7 = 630\]