| Answer | Crossword Clue |
|---|---|
| VIGESIMAL | Based on the number 20 |
| VICENARY | Based on the number 20 |
| OCTAL | Based on the number eight |
| SENARY | Based on the number six |
| OCTAL | Based on the number 8 |
| SESTINAS | Poems whose structure is based on the number six |
| AXLES | Highway tolls may be based on the number of them |
