The winning Washington DC DC-4 numbers for August 15, 1988 were: single 2-9-4-0.
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 |
|---|---|---|---|---|
| Aug 15, 1988 | Single | 2-9-4-0 | 15 | 6 |
| Aug 13, 1988 | Single | 7-1-6-1 | 15 | 6 |
| Aug 12, 1988 | Single | 5-9-4-5 | 23 | 5 |
| Aug 11, 1988 | Single | 0-1-1-8 | 10 | 1 |
| Aug 10, 1988 | Single | 5-3-0-4 | 12 | 3 |
| Aug 9, 1988 | Single | 2-6-3-9 | 20 | 2 |