| Clue | Source | Date |
|---|---|---|
| Lowest common multiple | The Telegraph Cross Atlantic | 18 Aug 2025 |
| 20, in relation to 4, 5, and 10: abbr. | ||
| HCF's partner in maths: Abbr. | ||
| 420, for 20 and 21 (abbr.) | Jonesin | 13 Oct 2020 |
| 40, to 10 and 8: Abbr. | ||
| 12, to 6 and 4: Abbr. | ||
| Math initials | ||
| Math abbr. |