The TI-84 Plus CE online calculator detects errors while performing these tasks:
| • | Evaluating an expression |
| • | Executing an instruction |
| • | Plotting a graph |
| • | Storing a value |
| 1. | Determine the error. The error screens give helpful hints about what may have happened, but the errors are not always fully explained. |
| 2. | Correct the expression. |