| REDIVIDED | Did a mathematical action again (9) |
| LOGARITHM | Moth a girl might turn into a mathematical aid (9) |
| REMAINDER | A hint about a mathematical term (9) |
| NILPOTENT | A mathematical quantity that becomes zero when raised to a particular power (9) |
| CALCULATE | Figure to solve a mathematical problem (9) |
| ALGORITHM | Procedure for solving a mathematical problem |
| FIBONACCI | Eponym for a mathematical pattern identified centuries earlier in India |
| PIECEWISE | Like a mathematical function that changes at different intervals |
| REDO | Perform (action) again |
| RESTART | Support craft get into action again |
| RESTED | Ready for action again |
| REMOVE | Take action again, perhaps, to get rid of something (6) |
| REARREST | Take police action again and bring up the others! (8) |
| BACK | Into action again - war like this is painful (4,2,5) |
| OPERATOR | A telephonist or other technician; a symbol indicating a mathematical function; a trader; a mover; or, a wheeler-dealer (8) |
| ROTATION | A word for a spin of a planet, turn of a wheel or other axial turn; a cycle of alternating arable fields for crops or felling trees; a mathematical curl; or, any recurrent order (8) |
| CURL | A mathematical vector operator, also called a rotation; a ringlet of hair; an eddy; or, a weight-training exercise for strengthening one's biceps (4) |
| ANSWER | Solution to a mathematical problem, crossword or quiz; element of a fugue; or, an echo of a sound (6) |
| MEET | An assembly of horses, hounds and hunters prior to a chase; a swimming gala or other athletic event; or, a mathematical intersection (4) |
| RADIUS | Word, from "spoke, rod", for a measurement of distance from a centre point, whether in a mathematical or anatomical context (6) |
