Compare the digits from left to right.<br><br>All numbers have 5 digits. Compare the ten-thousands: all are 5.<br>Compare the thousands: 2, 2, 1, 2.<br>&bull; 51328 has thousands digit 1, which is the smallest, so it comes first.<br>&bull; The remaining three (52138, 52318, 52813) all have thousands digit 2. Compare hundreds: 1 &lt; 3 &lt; 8. So 52138, then 52318, then 52813.<br><br>Final Answer: 51328, 52138, 52318, 52813