The winning Washington DC DC-3 numbers for October 18, 1988 were: single 1-7-0.
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 |
|---|---|---|---|---|
| Oct 18, 1988 | Single | 1-7-0 | 8 | 8 |
| Oct 17, 1988 | Single | 0-9-9 | 18 | 9 |
| Oct 15, 1988 | Single | 1-1-2 | 4 | 4 |
| Oct 14, 1988 | Single | 9-9-0 | 18 | 9 |