Question about Texas Instruments TI-89 Calculator

My kids got a hold of my calculator. Now it won't convert fractions to decimals. What mode is it stuck in?

Apparently it's stuck in Exact mode. Press MODE then F2, move down to "Exact/Approx", press right-arrow, and choose the desired mode.

FYI: even when you get a fraction, you can convert it to decimal by pressing Diamond followed by ENTER.

Posted on Apr 30, 2010

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Posted on Jan 02, 2017

This calculator cannot do algebra so it does not handle polynomials. It does not have an EQN (equation) solving mode so you cannot enter an expression set = 0 and solve it for an unknown variable X.

It does have a table Mode where you can enter an expression y= F(X) and generate a table of values. If in the expression F(x) a numerical coefficient is a fraction just enter it as a fraction, possibly enclosed in parentheses. If it is a decimal number just enter it as a decimal number. Converting it to a fraction is not going to generate any more precision in the result. You lose precision when you go from fraction to decimal, but you do not make a number more precise by converting it from a decimal representation to a fraction.

It does have a table Mode where you can enter an expression y= F(X) and generate a table of values. If in the expression F(x) a numerical coefficient is a fraction just enter it as a fraction, possibly enclosed in parentheses. If it is a decimal number just enter it as a decimal number. Converting it to a fraction is not going to generate any more precision in the result. You lose precision when you go from fraction to decimal, but you do not make a number more precise by converting it from a decimal representation to a fraction.

Nov 16, 2013 | Casio fx-300ES Calculator

In MathIO Mode

When you get a result as a radical (root) or a fraction, you can always convert it to its decimal approximate by pressing the [S-D] key. Pressing the [S-D] key a second time usually gives you back the fraction/radical form, but not always.

In LineIO Mode all results are expressed as decimals.

When you get a result as a radical (root) or a fraction, you can always convert it to its decimal approximate by pressing the [S-D] key. Pressing the [S-D] key a second time usually gives you back the fraction/radical form, but not always.

In LineIO Mode all results are expressed as decimals.

Aug 27, 2011 | Casio FX-115ES Scientific Calculator

The calculator has two Input/Output modes: MathIO and LineIO.

LineIO

LineIO is the old way of entering numbers in calculators and results are always displayed as decimal numbers. Some calculators have a fraction feature and would convert a fraction to a decimal number and back.

MathIO

In MathIO you enter expressions as you would by hand or as you see them written in textbooks.

In this mode, results are by default displayed as fraction or fractions/ radicals.

Conversion

To convert the fraction/radical to decimals you just press the [SD] key. If you press again you cycle through all the available display formats.

So you can (if you want) use the MathIO to manipulate expressions and convert only the last result to decimal. By the way, fractions and radicals are generally more accurate than their decimal representations.

SetUP

If however seeing fractions and radicals is too painful, just set the LineIO as your default mode. To do so press [SHIFT][MODE] to open (SETUP), then select [2:LineIO]

LineIO

LineIO is the old way of entering numbers in calculators and results are always displayed as decimal numbers. Some calculators have a fraction feature and would convert a fraction to a decimal number and back.

MathIO

In MathIO you enter expressions as you would by hand or as you see them written in textbooks.

In this mode, results are by default displayed as fraction or fractions/ radicals.

Conversion

To convert the fraction/radical to decimals you just press the [SD] key. If you press again you cycle through all the available display formats.

So you can (if you want) use the MathIO to manipulate expressions and convert only the last result to decimal. By the way, fractions and radicals are generally more accurate than their decimal representations.

SetUP

If however seeing fractions and radicals is too painful, just set the LineIO as your default mode. To do so press [SHIFT][MODE] to open (SETUP), then select [2:LineIO]

Feb 17, 2011 | Casio fx-300ES Calculator

Dec 06, 2010 | Texas Instruments TI-89 Calculator

If result displayed is to be converted, press the S-D key. This will toggle display from decimal to fraction and from fraction to decimal.

To force a result to be in decimal format press SHIFT = instead of just =.

To configure calculator to display only decimals, press the SHIFT MODE key sequence to enter SETUP and seledct 2:LineIO.

To force a result to be in decimal format press SHIFT = instead of just =.

To configure calculator to display only decimals, press the SHIFT MODE key sequence to enter SETUP and seledct 2:LineIO.

Oct 14, 2010 | Casio fx-300ES Calculator

Pressing the [S

Sep 10, 2010 | Casio fx-300ES Calculator

The calculator automatically reduces all fractions to simplest terms.

Or do you mean to convert it to decimal? To convert a single result to decimal, press the S

Or do you mean to convert it to decimal? To convert a single result to decimal, press the S

Mar 06, 2010 | Casio FX-115MS Plus Calculator

if you do not want to change your settings There are two ways to foecr calculator to display a result in a decimal format.

Press [SHIFT][MODE] to access (Setup) and select [2:LineIO].

Just in case you want to revert to the other IO mode (MthIO)

Press [Shift][MODE][1:MthIO]

- Before pressing the [=] sign to get the result press [SHIFT] key. thus [SHIFT][=] displays a result in decimal format.
- If a result is already displayed and it is not in decimal format (fraction or radical) press the [S<=>D] key to convert it to decimal.
- The [S<=>D] key toggles between formats (fraction/radical to decimal and from decimal to fraction or radical depending on the format used in calculation.)
- That does not mean that every decimal number can be converted to fractions/radical.

Press [SHIFT][MODE] to access (Setup) and select [2:LineIO].

Just in case you want to revert to the other IO mode (MthIO)

Press [Shift][MODE][1:MthIO]

Feb 15, 2010 | Casio FX-115ES Scientific Calculator

You can convert between Standard Form (with fractions and pi) or
Decimal form by using the "S<->D" button. Use Mode 1 if you
mostly prefer fraction answers and you can use the SD button to convert
to decimal or use Mode 2 if you mostly prefer decimal answers and use
the SD button to see the fraction.

I hope this helps and good luck!

Please remember to vote Thanks.

I hope this helps and good luck!

Please remember to vote Thanks.

Oct 31, 2009 | Casio FX-115ES Scientific Calculator

To change from Fraction display to Decimal display on the Casio fx-300ES (and probably other calculators)

1) Press the "SHIFT" button

2) Press the "MODE/SETUP" button

3) Press the "2" button

This Changes it to LINEIO (Decimal)

Doing all of the above but pressing the "1" button instead of the "2" puts it back into MATHIO mode (Fraction)

Hope this Helps

(SHIFT)(MODE/SETUP)(2) to change to decimal

1) Press the "SHIFT" button

2) Press the "MODE/SETUP" button

3) Press the "2" button

This Changes it to LINEIO (Decimal)

Doing all of the above but pressing the "1" button instead of the "2" puts it back into MATHIO mode (Fraction)

Hope this Helps

(SHIFT)(MODE/SETUP)(2) to change to decimal

Nov 07, 2008 | Casio fx-300ES Calculator

May 21, 2014 | Texas Instruments TI-89 Calculator

Feb 17, 2014 | Texas Instruments TI-89 Calculator

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