Question about Casio FX-115ES Scientific Calculator

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Casio Fx-82TL calc display problem

I have just changed the batteries for my calculator. but the the extreme 2 digits on screen have gone partly invisible. So I cannot see the tenth and zeroth values of a calculation. I checked the ribbon cable..that connects the diplay..it is perfectly fine. I have done the screen test..no go. Resetting the calc doesn't help. Nor does taking off batteries and putting them back on. Any help. Dont feel like throwing it away...but at the same time...repair would cost as much as a new calc.

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It seems the problem is on the lcd. technicians usually use soldering iron to apply heat to the cable connecting the lcd to its mainboard.

Posted on Sep 30, 2008

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F(x)=-x2 -1

Posted on Nov 12, 2008

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1 Answer

How to round to nearest tenth with the number 25,099


TenTH = A fraction of a whole, the 'th' tells that.
So, since 25,099 is a 'Whole' number, with No fraction of a whole, or no part/fraction of 1, therefor, rounded to the nearest tenth, it remains the same.

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Wont turn on


Just which steps have you gone through?

TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.


If this doesn't do it, please reply to this post and we can go to the next step.

Jan 21, 2013 | Texas Instruments TI-83 Plus Calculator

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Round 6.28 to the nearest tenth


(hundreds) (tens) (ones) DECIMAL POINT (Tenths) (hundredths)
So you have six and 28 hundredths. If nearest tenth is 2 the number after it is an 8, therefore the 8 is rounded UP to 10 and the 2 becomes a three.

Feb 24, 2012 | Office Equipment & Supplies

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How to raise to the tenth power


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Feb 01, 2012 | Casio FX-250HC Calculator

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How many tenths there are in 11/2?


Just convert the 1 and 1/2 to a fraction and then multiply the top and bottom (numerator and denominator) by 5 to see that fraction in tenths.

Multiplying both the numerator and the demominator of a fraction by the same number does not change the value of the fraction.

1 1/2 is the same as 3 / 2

Now multiply both top and bottom by 5.

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Therefore there are 15 tenths in 1 1/2.

Good luck I hope this helps.

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How to calculate the standard deviation? casio power graphic fx-7400G Plus


Here are the capabilities of the Casio calculators.
The screen captures may not look like ones taken from the FX-7400G
plus display but the instructions are accurate.
In stat enter the values in List1 and the frequencies in List2 (if doing paired variable statistics)
Press the key corresponding to the CALC tab

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Press the 1-var tab and you get the results as seen on the screen with title 1-variable.
Other screens show some two-variable stats or regressions.

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Use you knowledge of sample standard deviations and
population standard deviation to select which is relevant to your case.
They are given by xsigma-n and xSigma n-1
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1 Answer

I am using a casio fx 9860 .... i dont know how to change the mode to linear it and how to do log when the base is not 10 .... like log 2


In Run screen press [SHIFT][MODE] to enter SetUp.
Look for the line Input Mode (it is the 1st on the SD version). Highlight the line then press the TAB at the bottom of screen that says Lin (F2 key). Press EXE when you finish with SetUp.

To use the logab( function,
1. open the Run/Mat screen.
2.Press the OPTN key.
3.Press [F4:Calc].
4. Press [F6:].
5. Press [F4:logab]

the command is displayed on the screen,.
6. Enter the base then the argument).
7. Close parenthesis if you want and
8. press EXE.
Example logab(2,8) =3

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1 Answer

My calculator keeps rounding to the tenths place, I read I need to go to mode and change a setting, but I cannot find mode?


I am describing the procedure for the CAS with OS version 2.1 But it should work for your calculator.

  1. Turn calculator ON
  2. Press The HOME (House icon) button.
  3. Press digit key 5 to open Settings and status.
  4. In menu options, select [2:Settings]
  5. Use the arrow (right) to open the submenu options and select [1:General]
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  7. Use down arrow to open the number display format, and select Float 6 (an appropriate choice most of the time. If you want more digits, set Float 12)
  8. Press [ENTER] or Click to validate your selection.
  9. The drop down box will close.
  10. Use the TAB button to move to another Configuration setting. Pressing the TAB twice will take you to Exponential format.
  11. Use down arrow to unfold the Exponential format menu.
  12. If you do not need Scientific Format, use Normal and validate.
  13. Press TAB several times until cursor reaches OK.
  14. At this point Press ENTER to save Configuration.
  15. This should solve the problem.

As I said, this describes the procedure for OS version 2.1. Once you find out how to enter the setting screen, do as I described above, and do not forget to validate by getting the cursor on OK and validate.

May 01, 2011 | Texas Instruments TI-Nspire Graphic...

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We are trying to graph an equation but we cannot seem to use the F1 key. The alpha won't toggle it on. And the exponent button only allows for 1 character, but we need 2. Everything works fine on a...


The F1 key is activated by pressing the alpha (green button) and then the f1 key. If that doesn't work then your calculator may be broken and you might want to check with your warranty to get a new one.
As for the exponent key you can do this by pressing the ^ key and then placing parentheses around the two digit exponent. An example for 2 to the tenth power would be: 2^(10)

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