Chip trading is a common place-value model that uses colored chips and a mat. In base ten, the columns on the mat represent powers of ten. For example, 4523 is represented by 4 red, 5 green, 2 blue, and 3 yellow chips.
$$
\begin{array}{c|c|c|c}
\hline \text { Red } & \text { Green } & \text { Blue } & \text { Yellow } \\
\hline 4 & 5 & 2 & 3 \\
\hline
\end{array}
$$
(a) How would you represent 372 ?
(b) Ten blue chips can be traded in for one _______ chip.
(c) Which is more abstract, chip trading or base-ten blocks? Explain why.