How to reset your calculator before an exam
fx-991EX: SHIFT 9 (RESET) → Initialize All → Yes.fx-991CW: SETTINGS → Reset → Initialize All → Yes.fx-CG50: MENU → System → RESET → MAIN → Yes.
Your exams officer may ask for a reset before an exam, and it is the quick fix when old lists or settings give strange answers. A reset deletes what you have stored, so copy anything you need first.
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How do I reset the fx-991EX?
- Press SHIFT 9 (RESET).
- Choose Initialize All.
- Choose Yes.
Casio: this puts the calculation mode and the setup (all but Contrast) back to their defaults and clears all data in the calculator's memory.
Only want to clear the stored values? SHIFT 9 (RESET) → Memory → Yes clears Ans, the independent memory and the variables. Only the settings? RESET → Setup Data → Yes.
How do I reset the fx-991CW?
- In a calculator app (such as Calculate), press SETTINGS.
- Choose Reset → Initialize All.
- Choose Yes.
Casio: this puts every setting except Contrast and Auto Power Off back to its default and clears all data in the calculator's memory, including the calculation history.
Reset → Variable Memory clears just the variables; Reset → Settings & Data resets the settings and clears everything except the variables and Ans.
Source: Casio fx-991CW User's Guide: Initializing the Calculator
How do I reset the fx-CG50?
- Press MENU and open System.
- Choose RESET on the function-key row.
- Choose MAIN (the main memory) and confirm with Yes, then press EXIT.
Casio: a reset deletes the data in that memory (your lists, matrices, variables and programs) and puts the settings back to their defaults. Back up anything you want to keep first.
Casio's System → RESET screen has other choices (such as the setup only). The function-key numbers depend on the OS, so read the labels on the screen. In IB Examination Mode the memory is locked anyway.
Source: Casio UK worksheet: Calculations and reset, fx-CG50 (PDF) · Casio fx-CG50 Software User's Guide (PDF): SET UP and Reset
How do I reset the TI-84 Plus CE?
- Press 2nd mem (MEM).
- Choose 7: Reset.
- Choose All Memory, then Reset to confirm.
TI: this permanently deletes all data, programs and apps on the calculator. Press-to-Test is the temporary option: it turns things off for the exam and gives them back afterwards.
Source: TI-84 Plus CE exam prep guide: Reset Memory & Press-to-Test
How do I reset the TI-Nspire CX II?
TI's exam guide uses Press-to-Test for the TI-Nspire CX II: it hides your documents for the exam and gives them back afterwards, so you do not lose your work. We have not found a full memory reset in the guides we checked, so we do not give one here. How Press-to-Test works.
Source: TI-Nspire CX II exam guide: Reset Memory & Press-to-Test · TI-Nspire Press-to-Test Guidebook (PDF)
After a reset
A reset puts the angle unit and the number format back to the calculator's defaults. Check them before you start: degrees or radians, and fractions or decimals.
Questions
How do I reset my fx-991EX?
Press SHIFT 9 (RESET). Choose Initialize All. Choose Yes. Casio: this puts the calculation mode and the setup (all but Contrast) back to their defaults and clears all data in the calculator's memory.
How do I reset my fx-991CW?
In a calculator app (such as Calculate), press SETTINGS. Choose Reset → Initialize All. Choose Yes. Casio: this puts every setting except Contrast and Auto Power Off back to its default and clears all data in the calculator's memory, including the calculation history.
How do I reset my fx-CG50?
Press MENU and open System. Choose RESET on the function-key row. Choose MAIN (the main memory) and confirm with Yes, then press EXIT. Casio: a reset deletes the data in that memory (your lists, matrices, variables and programs) and puts the settings back to their defaults. Back up anything you want to keep first.
How do I reset my TI-84 Plus CE?
Press 2nd mem (MEM). Choose 7: Reset. Choose All Memory, then Reset to confirm. TI: this permanently deletes all data, programs and apps on the calculator. Press-to-Test is the temporary option: it turns things off for the exam and gives them back afterwards.
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Sources
Every keystroke on this page comes from the manufacturer's own guide for that model, and every exam rule from the exam board's own document; each section names its source. Where we could not find a step in one of those documents, we have left it out. A Level Math Revision is independent and is not connected to Casio, Texas Instruments or any exam board.