Question about Casio FX-115ES Scientific Calculator

Using a ti 89 titanium calculator

This is a partial solution for I do not have the TI89 titanium with me.

1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).

In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :

x/6 + 1/2 yields x/6 + 1/2

x/6. + 1/2 becomes .166666..x +1/2

x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

Posted on Aug 17, 2009

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Posted on Jan 02, 2017

http://education.ti.com/downloads/guidebooks/graphing/89ti/TI-89_Guidebook_EN.pdf

that should be the TI 89 Titanium guide

that should be the TI 89 Titanium guide

Aug 27, 2011 | Texas Instruments TI-89 Calculator

You can do it per problem by using the exact( function, or you can change the mode so that it always displays fractions by changing EXACT/APPROX from Auto to Exact

Aug 04, 2011 | Texas Instruments TI-89 Calculator

You can convert any symbolic result to a numeric result by pressing diamond ENTER. If you want all results to come out numeric, press MODE F2, use the arrow keys to move down to the "Exact/Approx" line, press right-arrow, select "APPROXIMATE", then press ENTER. Press ENTER one more time to save the change and exit.

Jun 01, 2011 | Texas Instruments TI-89 Calculator

Dec 06, 2010 | Texas Instruments TI-89 Calculator

If you want to convert a single value, press Diamond then ENTER.

If you want them all in decimal, press MODE, scroll down to Exact/Approx, and change the setting to suit.

If you want them all in decimal, press MODE, scroll down to Exact/Approx, and change the setting to suit.

Jun 08, 2010 | Texas Instruments TI-89 Calculator

To convert a single result from fraction to decimal, press Diamond followed by ENTER.

To make the calculator do everything in decimal instead of fraction, press MODE, then F2. Scroll down to "Exact/Approx", then press right-arrow. Change the setting from EXACT to one of the others.

To make the calculator do everything in decimal instead of fraction, press MODE, then F2. Scroll down to "Exact/Approx", then press right-arrow. Change the setting from EXACT to one of the others.

Apr 27, 2010 | Texas Instruments TI-89 Calculator

If you leaf through the manual with its 500 some pages you will diuscover that your last statement is not quite right.

The "problem" is that the calculator is configured to perform EXACT calculation where fractions are kept as fractions and radicals as radicals.

To have your fractions displayed as decimal numbers ALL THE TIME

Press [MODE][F2]

Use Arrow down to highlight [Exact/Approx

Use right arrow to unfold the menu list and select [3:Approximate]

Press [ENTER] to save configuration

There are two other ways to convert an exact result into an approximate one

The "problem" is that the calculator is configured to perform EXACT calculation where fractions are kept as fractions and radicals as radicals.

To have your fractions displayed as decimal numbers ALL THE TIME

Press [MODE][F2]

Use Arrow down to highlight [Exact/Approx

Use right arrow to unfold the menu list and select [3:Approximate]

Press [ENTER] to save configuration

There are two other ways to convert an exact result into an approximate one

- If you enter 25./3 or 25/3. or 25/3. and press [ENTER] the fraction will be displayed as a decimal number (The dot is a decimal mark, and it instructs calculator to perform approximate calculations)
- If enter 25/3 without the decimal marks and press [Diamond][ENTER] the result will be decimal.

Feb 17, 2010 | Texas Instruments TI-89 Calculator

Here is what you do:

1) Press the Mode button.

2) Scroll down the list that appears until you find "Exact/Approx".

3) Change the setting for "Exact/Approx" to Exact.

4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":

1) Auto - The calculator will try to determine the best format.

2) Exact - The calculator will always give the answer in fraction form.

3) Approximate - The calculator will always give the answer in decimal form.

1) Press the Mode button.

2) Scroll down the list that appears until you find "Exact/Approx".

3) Change the setting for "Exact/Approx" to Exact.

4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":

1) Auto - The calculator will try to determine the best format.

2) Exact - The calculator will always give the answer in fraction form.

3) Approximate - The calculator will always give the answer in decimal form.

Nov 15, 2009 | Texas Instruments TI-89 Calculator

if you hit the diamond key before enter you will always get your solution as a decimal

Sep 08, 2009 | Texas Instruments TI-89 Calculator

Are you using a ti-89? If so, check your mode settings and change Exact to Approximate.

Feb 06, 2009 | Texas Instruments TI-89 Calculator

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