Part 4 of 5 Points: 0 of 1 Write the number in expanded form. fourteen million, four hundred nine thousand, seventy Write a digit $(0,1,2, \ldots, 9)$ in each of the following five answer boxes that are presented one by one. fourteen million, four hundred nine thousand, seventy $=\left(1 \cdot 10^{7}\right)+\left(4 \cdot 10^{6}\right)+\left(4 \cdot 10^{5}\right)+\left(\square \cdot 10^{3}\right)+$

Step 1 ：The number fourteen million, four hundred nine thousand, seventy can be written as $14{,}409{,}070$. This equals $1\text{ ten millions}+4\text{ millions}+0\text{ hundred thousands}+9\text{ thousands}+0\text{ hundreds}+7\text{ tens}+0\text{ ones}$

Step 2 ：Now, let's fill in $10{,}000{,}000+4{,}000{,}000+9{,}000+70$ on the place value chart.

Step 3 ：So, the missing digit in the expanded form is $9$. Therefore, fourteen million, four hundred nine thousand, seventy $=\left(1 \cdot 10^{7}\right)+\left(4 \cdot 10^{6}\right)+\left(0 \cdot 10^{5}\right)+\left(0 \cdot 10^{4}\right)+\left(9 \cdot 10^{3}\right)+\left(0 \cdot 10^{2}\right)+\left(7 \cdot 10^{1}\right)+\left(0 \cdot 10^{0}\right)$

Step 4 ：So, the final answer is \(\boxed{9}\)