How to change a fraction to a decimal on your calculator (and back)
fx-991EX: S⇔D.fx-991CW: FORMAT → Decimal (or Standard).fx-CG50: S⇔D.
Give the exact answer (a fraction, √ or π) when the question asks for it, and the decimal when it asks for significant figures or decimal places. Your calculator switches between the two in one or two key presses.
Fraction to decimal (and back) on your calculator
Pick your calculator: the page remembers it next time.
How do I change a fraction to a decimal on the fx-991EX?
- After the answer appears, press S⇔D to switch between the fraction (exact) form and the decimal.
- Press S⇔D again to switch back.
Casio: some results will not convert. To get decimals every time, set SETUP (SHIFT MENU) → Input/Output to MathI/DecimalO.
Source: Casio fx-991EX / fx-570EX User's Guide (PDF) · Casio fx-991EX Quick Start Guide (PDF)
How do I change a fraction to a decimal on the fx-991CW?
- After the answer appears, press FORMAT.
- Choose Decimal for the decimal, or Standard for the fraction, √ or π form.
Casio: Standard with √ or π needs Input/Output set to MathI/MathO or MathI/DecimalO, and some results will not convert. To get decimals every time, set Input/Output on the SETTINGS menu to MathI/DecimalO.
Source: Casio fx-991CW User's Guide: Standard and Decimal Conversion · Casio fx-991CW User's Guide: Using the SETTINGS Menu
How do I change a fraction to a decimal on the fx-CG50?
- After the answer appears, press S⇔D to switch between the fraction and the decimal.
Source: Casio UK: Getting started with the fx-CG50, guide for teachers
How do I change a fraction to a decimal on the TI-84 Plus CE?
- After the answer, press math.
- Choose 1: ►Frac for a fraction or 2: ►Dec for a decimal.
- Press enter.
How do I change a fraction to a decimal on the TI-Nspire CX II?
- Type the calculation and press ctrl enter instead of enter: the answer comes out as a decimal (approximate).
TI: by default the Calculator keeps the exact form (a fraction). approx( ) also gives the decimal.
Source: TI-Nspire guidebook: Entering and Evaluating Math Expressions
Questions
How do I change a fraction to a decimal on the fx-991EX?
After the answer appears, press S⇔D to switch between the fraction (exact) form and the decimal. Press S⇔D again to switch back.
How do I change a fraction to a decimal on the fx-991CW?
After the answer appears, press FORMAT. Choose Decimal for the decimal, or Standard for the fraction, √ or π form.
How do I change a fraction to a decimal on the fx-CG50?
After the answer appears, press S⇔D to switch between the fraction and the decimal.
How do I change a fraction to a decimal on the TI-84 Plus CE?
After the answer, press math. Choose 1: ►Frac for a fraction or 2: ►Dec for a decimal. Press enter.
How do I change a fraction to a decimal on the TI-Nspire CX II?
Type the calculation and press ctrl enter instead of enter: the answer comes out as a decimal (approximate).
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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. IGCSE Math Revision is independent and is not connected to Casio, Texas Instruments or any exam board.