If We Write the First 10,000 Numbers in Six Columns $\begin{array} { l l l l l l } 1 & 2 & 3 & 4 & 5 & 6 \\7 & 8 & 9 & 10 & 11 & 12\end{array}$

True/False

If we write the first 10,000 numbers in six columns, as started below, then 9999 would be in the fifth column. Write enough (numbers, words) to make your thinking clear.
$\begin{array} { l l l l l l } 1 & 2 & 3 & 4 & 5 & 6 \\7 & 8 & 9 & 10 & 11 & 12\end{array}$