What you can calculate
- Arithmetic: add, subtract, multiply, divide.
- Percentages: convert a value to its fraction with the % key (e.g., 12% → 0.12).
- Powers & roots: square (x²) and square root (√) for quick scale checks.
Keyboard shortcuts
| Action | Key | Example |
|---|---|---|
| Evaluate | Enter | 12*1.25 → 15 |
| Add/Subtract | +, − | 100-35 → 65 |
| Multiply/Divide | *, / | 8/3 → 2.6667… |
| Clear | C button | Reset display |
Percentage examples
- Convert percent to decimal: 12% → 0.12
- Apply a discount: Price × (1 − 15%) = Price × 0.85
- Add tax: Subtotal × (1 + 7%) = Subtotal × 1.07
Safety & input rules
Allowed: digits, + - * / ( ) .
Disallowed: letters/functions — invalid input returns Err.