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

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

X + 1) = 7

Posted on Oct 30, 2008

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Posted on Jan 02, 2017

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 **+/-**

The change sign key may be marked

Nov 08, 2013 | HP 35s Scientific Calculator

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.

May 13, 2010 | Texas Instruments TI-84 Plus Calculator

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.

[)] is the enclosing right parenthesis

[+/-] is the Sign Change 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.

[)] is the enclosing right parenthesis

[+/-] is the Sign Change key

May 06, 2010 | Casio FX-260 Calculator

Do not use the main MINUS sign for subtraction. Rather, use the change sign key. The key may have a + and - with two arrows, one pointing left the other right. On some calculators the key is marked with (-)

Apr 14, 2010 | Texas Instruments TI-30X-IISTK Scientific...

There is a key with a "+" sign, 2 arrows and a "-" sign. After you enter a number, hit this key to change it's sign. Hope this helps. Good luck!

Mar 04, 2010 | Texas Instruments TI-30XA Calculator

To use the log function you press the [LOG] key in the middle of the first row of keys.

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.

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.

Mar 01, 2010 | Texas Instruments TI-30XA Calculator

Hi,

Ex: calculate -log(15.32)

Here is a picture of the change sign

Hope it helps

Ex: calculate -log(15.32)

- Calculate the log 15.32 [LOG] [=] result 1.185258765
- Then press the change sign key (-) result -1.185258765

Here is a picture of the change sign

Hope it helps

Dec 13, 2009 | Texas Instruments TI-30XA Calculator

Hello Michelle,

Sorry, the answer was posted as a clarification request. Here it is again.

1. 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

Hope it helps.

Sorry, the answer was posted as a clarification request. Here it is again.

1. 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

Hope it helps.

Nov 01, 2009 | Texas Instruments TI-30XA Calculator

Hello,

To use the exponential function,**you must enter the number then press [2nd][e to the x] or [e^x] for short.**

e^(-0.1) is entered as (-)0.1 [2nd][e^x], where**(-)** is the change sign key

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.

Hope it helps.

To use the exponential function,

e^(-0.1) is entered as (-)0.1 [2nd][e^x], where

You will need to use extra parentheses to avoid errors.

The Minus sign between 20 and 18 is the regular one. The

Hope it helps.

Oct 03, 2009 | Texas Instruments BA-II Plus Calculator

Hello,

It is the key with a minus sign enclosed in parentheses**(-)**

Hope you find it.

It is the key with a minus sign enclosed in parentheses

Hope you find it.

Aug 25, 2009 | Texas Instruments TI-30X-IISTK Scientific...

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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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