| Addition | 11 | 12 | 13 | 14 | 15 |
| 9 | 11+9 = 20 | 12+9 = 21 | 13+9 = 22 | 14+9 = 23 | 15+9 = 24 |
| 10 | 11+10 = 21 | 12+10 = 22 | 13+10 = 23 | 14+10 = 24 | 15+10 = 25 |
| 11 | 11+11 = 22 | 12+11 = 23 | 13+11 = 24 | 14+11 = 25 | 15+11 = 26 |
| 12 | 11+12 = 23 | 12+12 = 24 | 13+12 = 25 | 14+12 = 26 | 15+12 = 27 |
| 13 | 11+13 = 24 | 12+13 = 25 | 13+13 = 26 | 14+13 = 27 | 15+13 = 28 |