**Regroup to express the number in a different way.**
$\begin{align}
76{,}830=& 7 \text{ ten thousands} +6\text{ thousands} + 8 \text{ hundreds} + 3 \text{ tens}
\\\\
76{,}830=& 6 \text{ ten thousands} +\bigstar\text{ thousands} + 8 \text{ hundreds} + 3 \text{ tens}
\end{align}$
$\bigstar=$ [[☃ numeric-input 1]]