| Button | FX-82ES | FX-83GTX | FX-85GTX | Remarks |
|---|---|---|---|---|
| SHIFT | ✅ | ✅ | ✅ | |
| ALPHA | ✅ | ✅ | ✅ | |
| Left, Right, Up, Down | ✅ | ✅ | ✅ | |
| MODE/MENU, SETUP | ✅ ✅ | ✅ ✅ | ✅ ✅ | 82ES has MODE but GTX has MENU |
| ON | ✅ | ✅ | ✅ | |
| Abs | ✅ | ✅ | ✅ | Key position has moved right on GTX |
| OPTN | ❌ | ✅ | ✅ | Abs exists on 82ES where OPTN exists on GTX |
| x³, : | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| x⁻¹, x! | ✅ ✅ | ✅ ✅ | ✅ ✅ | Moved down on GTX (overlaps with C) |
| log▗▯ | ✅ | ✅ | ✅ | |
| ■/□, ■ -□/□ | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| √■, ∛■ | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| x², recurring decimal | ✅ ❌ | ✅ ✅ | ✅ ✅ | |
| x▝, ▝√□ | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| log, 10▝ | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| ln, e▝ | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| (-), A | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| °'", FACT, B | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| hyp, C | ✅ ✅ | ❌ ✅ | ❌ ✅ | OPTN 1 provides hyperbolic functions on GTX |
| sin, sin⁻¹, D | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| cos, cos⁻¹, E | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| tan, tan⁻¹, F | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| RCL, STO | ✅ ✅ | ✅ ✅ | ✅ ✅ | STO, RECALL on GTX |
| ENG, ← | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| (, % | ✅ ✅ | ✅ ✅ | ✅ ✅ | % moved to Ans on GTX |
| ), ,, X | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| S⇔D, a b/c ⇔ d/c, Y | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| M+, M-, M | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| 7 | ✅ | ✅ | ✅ | |
| 8 | ✅ | ✅ | ✅ | |
| 9, CLR/RESET | ✅ ✅ | ✅ ✅ | ✅ ✅ | 82ES has CLR but GTX has RESET |
| DEL, INS, UNDO | ✅ ✅ ❌ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| AC, OFF | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| 4 | ✅ | ✅ | ✅ | |
| 5 | ✅ | ✅ | ✅ | |
| 6 | ✅ | ✅ | ✅ | |
| ×, nPr | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| ÷, nCr | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| 1, ⌜STAT⌝ | ✅ ✅ | ✅ ❌ | ✅ ❌ | MENU 2 provides ⌜STAT⌝ on GTX |
| 2 | ✅ | ✅ | ✅ | |
| 3 | ✅ | ✅ | ✅ | |
| +, Pol | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| -, Rec | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| 0, Rnd | ✅ ✅ | ✅ ✅ | ✅ ✅ | |
| ., Ran#, RanInt | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| ×10ˣ, π, e | ✅ ✅ ✅ | ✅ ✅ ✅ | ✅ ✅ ✅ | |
| Ans, DRG▸ | ✅ ✅ | ✅ ❌ | ✅ ❌ | OPTN 2 provides angle conversion on GTX |
| =, ≈ | ✅ ❌ | ✅ ✅ | ✅ ✅ |