- Calculus class calculations (AREAS with 5 letters)
- Geometry class calculation (AREA with 4 letters)
- Trig class calculation (SEC with 3 letters)
- Geometry-class calculation (AREA with 4 letters)
- Calculus class letters (QED with 3 letters)
- Math class calculation (e.g. ANTILOG with 7 letters)
- Calculus calculation: Abbr. (e.g. LIM with 3 letters)
- Trigonometry class calculation (SINE with 4 letters)
- Calculus calculation (e.g. AREA with 4 letters)
- Class often taken before calculus: Abbr. (TRIGON with 6 letters)