The winning Delaware Play 3 numbers for March 21, 1999 were: night 5-7-6.
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 |
|---|---|---|---|---|
| Mar 21, 1999 | Night | 5-7-6 | 18 | 9 |
| Mar 20, 1999 | Night | 5-3-7 | 15 | 6 |
| Mar 20, 1999 | Day | 9-7-9 | 25 | 7 |
| Mar 19, 1999 | Night | 5-8-1 | 14 | 5 |
| Mar 19, 1999 | Day | 5-4-0 | 9 | 9 |
| Mar 18, 1999 | Night | 6-3-6 | 15 | 6 |
| Mar 18, 1999 | Day | 0-0-8 | 8 | 8 |
| Mar 17, 1999 | Night | 9-3-8 | 20 | 2 |
| Mar 17, 1999 | Day | 0-5-0 | 5 | 5 |
| Mar 16, 1999 | Night | 4-3-6 | 13 | 4 |
| Mar 16, 1999 | Day | 7-9-6 | 22 | 4 |
| Mar 15, 1999 | Night | 8-1-1 | 10 | 1 |
| Mar 15, 1999 | Day | 1-3-4 | 8 | 8 |