The winning Washington DC DC-4 numbers for September 15, 1988 were: single 5-9-4-3.
Sum is the digits added together (5+5+0 = 10). Root sum keeps adding until one digit is left (10 → 1+0 = 1) — many regular players track it in their notebooks. Odd/Even marks each digit O or E (5-5-0 = OOE). High/Low marks 0–4 as L and 5–9 as H (5-5-0 = HHL).
| Date | Draw | Numbers | Sum | Root |
|---|---|---|---|---|
| Sep 15, 1988 | Single | 5-9-4-3 | 21 | 3 |
| Sep 14, 1988 | Single | 3-7-1-4 | 15 | 6 |
| Sep 12, 1988 | Single | 0-6-5-0 | 11 | 2 |
| Sep 10, 1988 | Single | 3-6-2-3 | 14 | 5 |
| Sep 9, 1988 | Single | 7-3-4-1 | 15 | 6 |