Question about Texas Instruments TI-83 Plus Calculator

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TI-83 plus problem

When I try to solve, for example, 0.01^2 I receive 1e-4 instead of 0.0001. How to fix this? In the MODE I chose "normal" and "float", but it still not giving me 0.0001

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Hello,
The calculator has limitations. No matter what number of decimal places you specify in the floating mode format, If the absolute value of the number is less than 0.001 the number is displayed in scientific format :
[digit][.][digt][digit] ...up to [digit9] [E][-][2 digit exponent].
Here are somme screen capture that show you that.

TI-83 plus problem - 4efe901.jpg
6aa6547.jpg
As you can see the two screens overlap. Floating mode is set to 4 decimal places. As long as the absolute value is less than 0.001, the number is displayed in scientific format. However when that absolute value exceeds 0.001 the display reverts to the floating mode format you want.

When you manipulate very small or very large numbers, the floating point format cannot be used because of the limitations of the screen.
In this last screen capture Floating mode is set at 9 decimal places. I entered the electron charge. The line is pretty full.
96b835a.jpg

Hope it clarifies things for you

Posted on Sep 16, 2009

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This is not a problem. It is standard for all TI-83 calculators. You just have to remember to move the decimal place LEFT (for negative "e"s) the number of the negative that you get.

So:
1e-4 = 0.0001

And
1e4 = 10000

Make sense?

You can't fix it. That's just the way they operate. You can adjust the MODE settings all you want, (don't try the "eng" mode because that's REALLY confusing) it won't change the number. Sorry if this confuses you.

Posted on Sep 10, 2009

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1 Answer

NOT SHOWING NEGATIVE EXPONENTS


Try this if you have parenthesis.
(5*10^-9)*(4,4*10-9).

I'm assuming you are using a comma as the decimal deliminator and are located in Europe. (4,4 instead of the English 4.4).

Your working example also has no spaces between the elements of yoyr formula. Watch this.

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Your calculator's display is set to Engineering notation.

Press MODE. Use the arrow keys to highlight "NORMAL" on the first line and press ENTER. Highlight "FLOAT" on the second line and press ENTER. Press 2ND [QUIT] to exit the mode screen.

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This is not an error. .001 multiplied by .001 is 1E-6.

If the absolute value of a number is less than .001, the calculator will always display it in scientific notation. 1E-6 is interpreted as 1 times 10 to the minus sixth power.

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Press MODE to bring up the mode editor. Press down-arrow to go to the second line. Use left/right-arrows to highlight NORMAL. Press ENTER to select it, then 2ND [QUIT] to exit the mode editor.

Alternatively, you can select any other display format.

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Radian mode does not work properly


-1E-13 is a very small number. When doing this kind of a problem you can regard 1E-13 as 0.

Remember that pi is an irrational number. It is only estimated on your calculator. I just played around with a TI-83 and found the following answers:

cos(pi/2) = 0
cos(2*pi + pi/2) = 0
cos(4*pi + pi/2) = 1E-13
cos(20*pi + pi/2) = -1E-13

As you know, that correct answer to each of these is 0. The calculator gives non-zero answers because some very small errors are accumulating. There is nothing wrong with your calculator.

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2 Answers

Scientific notation


press menu, there it says science or something like it

set it on float

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