Question about Texas Instruments TI-89 Calculator

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My kids got a hold of my calculator. Now it won't

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

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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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Polynomial equations

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.

Nov 16, 2013 | Casio fx-300ES Calculator

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I am trying to approximate square roots and need it to come out in a decimal but it won't allow me too.

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.

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

1 Answer

While using Casio fx-300ES , I am unable to get answers in decimals. For eg. 3/10...should give 0.3, but the answer is again displayed as 3/10. any way to solve this issue?

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

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.
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.

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

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How do i convert a decimal answer to fraction format on a TI 89 titanium.... prefferably with matrixes

It is just a matter of being in EXACT mode. To set your calculator in EXACT mode here's the key sequence. Press [MODE] [F3] [Up Arrow] [Up Arrow] [Right Arrow] [2] [ENTER]. Now when your in the Matrix Editor you can input your numbers in decimal form and, they will be automatically be converted to a fractional format. Pictured below is a matrix that was entered using decimal numbers and, was converted into factional form. Notice at the bottom of the screen the calculator is in EXACT mode.

Here's the same matrix in the HOME screen.

Next is the same matrix converted back to decimal numbers. Notice at the bottom of the screen the calculator is in APPROX mode.

And of course when I turn the calculator back to EXACT mode and, Re-ENTER the decimal formatted matrix in the HOME screen the fractional formatted matrix reappears.
You can use the propFrac( command but, having in the EXACT mode setting works better.

Dec 06, 2010 | Texas Instruments TI-89 Calculator

1 Answer

How do i convert fraction answers to decimals?

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.

Oct 14, 2010 | Casio fx-300ES Calculator

1 Answer

How do you reduce a fraction on a Casio

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

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

1 Answer

How to get answer in decimals instead of fraction

if you do not want to change your settings There are two ways to foecr calculator to display a result in a decimal format.
  1. Before pressing the [=] sign to get the result press [SHIFT] key. thus [SHIFT][=] displays a result in decimal format.
  2. 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.
  3. 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.)
  4. That does not mean that every decimal number can be converted to fractions/radical.
If you want to have all results in decimal format you can configue your calculator to always do so. All it takes is to set LineIO as the default Input/output 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]

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

1 Answer

How to convert fraction to decimal

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 51218db.jpg Thanks.

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

1 Answer

When I divide answers are always given in Fractions. Can I change it to come out in decimals?

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

Nov 07, 2008 | Casio fx-300ES Calculator

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