Question about Casio FX-115ES Scientific Calculator

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Where is the change sign key???

Can't find the change sign or +/- key on this calculator.

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  • winslowlady Oct 30, 2008

    This is not a solution for the change sign key. There is no change sign key on this calculator. 6+1=7 and to change sign of 7 after that entry, there is no key.


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Casio apparently omitted this key to facilitate its 'Natural Display' (textbook-like) entry capability. There is also no reciprocal key that returns a value with one press. You must use the x^-1 key and hit =.

Try the following:-
6+1=7. Now hit the ANS key. You can now backspace and insert the sign with the (-) key. This also works when changing from negative to positive.

A real nuisance, I agree. For many calculations I prefer my Casio fx-991d,
which must be almost 20 years old.

Posted on Jan 18, 2013

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X + 1) = 7

Posted on Oct 30, 2008

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Minus sign display problem

Calculators have two similar signs: the regular minus sign for subtraction, and the negation (change sign) sign. When applied, the latter changes the sign of the quantity to which it is applied. The minus sign - for subtraction is on the central line, the negation sign is smaller and somewhat raised above the center line.
The change sign key may be marked (-) , (+/-), or +/-

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The change sign key is the one marked with (-), a minus sign between parentheses. It is on the last row of keys, to the right of the dot, and below the 3 key.

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Negative log

Use the log function (common logarithm). See screen capture for markings on key.
To evaluate the negative of a logarithm
Enter the number (argument) of the logarithm
Press the = key to have it calculated.
While result is still displayed, press the sign change key or (+/-).

Beware that -log(number) is not necessarily a negative value.

Another way to calculate -log is to use the relation
log(1/a)=-log(a) .

Your example

3 [EXP] [(] [+/-] 2 [) ] [LOG][=] [+/-]

[EXP] is the key to enter exponent of a power of 10 :It is a shortcut, so no 10 is entered. Respect the key sequence above.
[ (] left parenthesis to prevent ambiguity due to the negaticve exponent. Just a security.
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2 Answers

Where is the negative button, I need to use negative numbers?

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1 Answer

How to perform log and - log function

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To use it.
Enter the number the log of which you want to calculate (must be positive)
Press the [LOG] key
Result is displayed.

Ex log(33.54)
33.54 [LOG] result is 1.5255

Once a logarithm has been calculated, use the [+/-] key, the change sign key located between the [.] and the [=] keys, on the bottom row of keys. You must press the change sign after you have calculated the logarithm.

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1 Answer

How do i find the negative log on a TI-30Xa


Ex: calculate -log(15.32)
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  2. Then press the change sign key (-) result -1.185258765
You can also try 15.32 [LOG] (-) [=]. Try to veriufy it on your calculator.

Here is a picture of the change signd677d4e.jpg
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1 Answer

How do i put in 10 to the negative 14th power?

Hello Michelle,

Sorry, the answer was posted as a clarification request. Here it is again.
7625e6b.jpg1. Use the key that appears on the sixth line in the picture. 10 [Y to the x] [(+/-)] 14 : the (+/-) is the change sign/ negation sign, not the regular minus sign. This key can be used to calculate the power with any exponent ( negative, positive, integer, fraction, decimal, ..) 2. The procedure above is not efficient since the calculator has a short cut to 10 to the power., the key labeled [EE}. With this key you enter 1.[EE] (+/-) 14

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You will need to use extra parentheses to avoid errors.

20 - 18*( (-)0.1 [2nd][e^x] ) [=]
The Minus sign between 20 and 18 is the regular one. The (-) before the 0.1 is the change sign key (-) or sometimes labeled +/-. The asterisk is the multiplication sign.
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1 Answer

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It is the key with a minus sign enclosed in parentheses (-)
Hope you find it.

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