\begin{aligned} 4{,}570=& 4 \text{ thousands} + 5 \text{ hundreds} + 7 \text{ tens} \\\\ 4{,}570=& 3 \text{ thousands} +\bigstar\text{ hundreds} + 7 \text{ tens} \end{aligned} 4,570= 4,570= 4 thousands+5 hundreds+7 tens 3 thousands+★ hundreds+7 tens ★ =
