Give the place to which each number has been rounded.
$$
\begin{array}{lrr}
\hline \text { Original Number } & \text { Rounded Number } \\
\hline \text { (a) } & 418 & 420 \\
\text { (b) } & 418 & 400 \\
\text { (c) } & 368,272 & 370,000 \\
\hline
\end{array}
$$