The winning Washington DC DC-4 numbers for September 16, 1989 were: single 1-5-6-6.
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 16, 1989 | Single | 1-5-6-6 | 18 | 9 |
| Sep 14, 1989 | Single | 8-9-7-5 | 29 | 2 |
| Sep 12, 1989 | Single | 1-7-4-1 | 13 | 4 |