Any digit greater than 5 is rounded up and any digit less than 5 is rounded down
Target = 10,000 (we are rounding up/down to ten thousand)
[tex]\begin{gathered} 999\approx1,000 \\ 9,999\approx10,000 \\ 11,999\approx12,000\approx10,000 \\ 13,999\approx14,000\approx10,000 \\ 19,999\approx20,000 \\ \\ \text{Hence, the correct answer is 9,999; 11,999 \& 13,999} \end{gathered}[/tex]