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Help... What is wrong with my TI-89 calculator? Whenever I try to calculate something, it gives me the wrong answer. For example, 160 divided by 50 will come up as 16/5. The calculator seems to be simplifying everything I put into it, rather than actually calculating it. I tried resetting it by press 2nd, Mem, F1 and resetting everything I could but it still doesn't work. How do I fix this?

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You're in either the Exact or Auto mode. You have two choices. If you want everything as a decimal approximation, you can change to the Approximate mode. Press MODE F2, then down arrow to Exact/Approx, left arrow, and then choose the mode you want. Alternatively, you can convert any expression to a decimal representation by pressing Diamond then ENTER.

Posted on Jan 23, 2010


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The integral cannot be calculated in terms of the elementary functions. It is given by dilogarithm Li_2. Note here that log stands for the natural logarithm (ln)


Jan 01, 2014 | Texas Instruments TI-89 Calculator

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My ti-83 plus is giving me the wrong answer only when i divide.

I am sorry, there is nothing to fix. The answer is perfectly correct. 62250/1450=439310344828
I think you meant to divide 65250 by 1450, the result of which is 45.

Jun 29, 2012 | Texas Instruments TI-83 Plus Calculator

1 Answer

I am dividing a 3*1 matrix with a 3*3 matrix with numbers in polar format and it gives me the error data type error.

You'll get the same error if you try to divide two matrices with real numbers. The TI-89 doesn't allow you to divide a matrix by another. However, you can multiply a matrix by the reciprocal of the other.

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

Sep 10, 2011 | Texas Instruments TI-89 Calculator

2 Answers

Solve() gives me wrong answer. -20^2=12^2+2X(-5-3). The answer is -16, But my TI-89 is giving me 34 during the solve funtion. my TI-83 is also giving me -20^2=-400 not 400.

Enter the first term as (-20^2), not as -20^2. Without the parentheses the calculator interprets it as
-(20^2), which is not what you want.

Also, make sure you use the (-) key just to the right of the decimal point and not the - key.

Aug 31, 2011 | Texas Instruments TI-89 Calculator

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When I divide, answers show up wrong.

Answers show in an unexpected (by you) format, but they are correct and in conformity with the MODE settings of the calculator.

If you want to have the results displayed as decimal numbers,
  1. open the HOME screen.
  2. Press MODE to open the Mode configuration.
  3. Press F2 or use the DownArrow to reach the second page of settings.
  4. Move Cursor to highlight the option at the right of EXACT/APPROX.
  5. Use the right arrow to unfold the menu and select 3:APPROXIMATE.
  6. Press ENTER to Save the changes.

Mar 22, 2010 | Texas Instruments TI-89 Calculator

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When I divide the answer is in fraction form not decimal form how do i get it back

There are two options.

1) Whenever you want the answer in decimal form, place a decimal after at least one of the numbers.
For example: instead of using (1/2) use (1/2.)

2) Press the "Mode" button. Scroll down the list that appears until you find "Exact/Approx". If you set it to "Approximate", then it will always give the answer in decimal form. If you set it to "Exact", it will give the answer in fraction form.

Nov 12, 2009 | Texas Instruments TI-89 Calculator

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Fraction problem

Go into MODE to the second page.  In Exact/Approximate, change it to Approx instead of Auto or Exact.  This will give you decimals instead of fractions.

Nov 17, 2007 | Texas Instruments TI-89 Calculator

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