Following is only the start of a child's work (in base ten). What seems lacking in this child's understanding? (Assume, perhaps unfairly, that the child is not thinking of negative numbers.) $\begin{array}{c}
\begin{array}{r}
402 \
\underline{-39} \
\ldots 7
\end{array}
\begin{array}{r}
506 \
\underline{-149} \
\ldots 3
\end{array}
\end{array}$

Question

Following is only the start of a child's work (in base ten). What seems lacking in this child's understanding? (Assume, perhaps unfairly, that the child is not thinking of negative numbers.) $\begin{array}{c}
\begin{array}{r}
402 \
\underline{-39} \
\ldots 7 
\end{array}
\begin{array}{r}
506 \
\underline{-149} \
 \ldots 3 
\end{array}
\end{array}$

Quizplus · Accepted Answer

The Answer of Following is only the start of a child's work (in base ten). What seems lacking in this child's understanding? (Assume, perhaps unfairly, that the child is not thinking of negative numbers.) $\begin{array}{c}
\begin{array}{r}
402 \
\underline{-39} \
\ldots 7 
\end{array}
\begin{array}{r}
506 \
\underline{-149} \
 \ldots 3 
\end{array}
\end{array}$

Following Is Only the Start of a Child's Work (In