- Calculus class letters (QED with 3 letters)
- Class often taken before calculus: Abbr. (TRIGON with 6 letters)
- Calculus class calculation (AREA with 4 letters)
- Calculus calculations (e.g. AREAS with 5 letters)
- Math class calculations (e.g. LOGS with 4 letters)
- Geometry class calculations (AREAS with 5 letters)
- Statistician's calculations (ERAS with 4 letters)
- Math-class word (INTO with 4 letters)
- Classic Steinbeck story, with "The" (REDPONY with 7 letters)
- H. Rider Haggard classic (SHE with 3 letters)