| 1 | un | 11 | undeg un | 10 | deg | ||
| 2 | dau | 12 | undeg dau | 20 | dauddeg | ||
| 3 | tri | 13 | undeg tri | 30 | trideg | ||
| 4 | pedwar | 14 | undeg pedwar | 40 | pedwardeg | ||
| 5 | pump | 15 | undeg pump | 50 | pumdeg | ||
| 6 | chwech | 16 | undeg chwech | 60 | chwedeg | ||
| 7 | saith | 17 | undeg saith | 70 | saithdeg | ||
| 8 | wyth | 18 | undeg wyth | 80 | wythdeg | ||
| 9 | naw | 19 | undeg naw | 90 | nawdeg | ||
| 10 | deg | 20 | dawddeg | 100 | cant |