| Rating | Solver | Clue |
|---|---|---|
| ABACUS | Calculator | |
| MATHEMATICIAN | Professional calculator? | |
| CPA | Professional calculator | |
| SLIDERULE | Pre-calculator device | |
| ADDER | Snake; calculator | |
| CLEAR | Calculator button is obvious | |
| ABACIST | One who uses an abacus in casting accounts; a calculator. | |
| COUNTER | One who counts, or reckons up; a calculator; a reckoner. | |
| ACCURATE | ...me standard of requirement, the result of care or pains; free from failure, error, or defect; exact; as, an accurate calculator; an accurate ... | |