Question about Casio FX-300MS Calculator

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How to change the sign of a number

Where is the [+/-] key ?

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The key is marked (-) and is two keys above the 7 key.

Posted on May 03, 2014

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Answer always appearing

Minus and change-sign are two completely different things. Minus is used to subtract one number from another. When you press minus when the input line is empty, your telling the calculator to subtract. The only way it can subtract the number you're about to put in is to subtract it from something else, and that something else is the previous answer, hence the "Ans."

If you want to input a negative number, use the change-sign key. If you want to subtract one number from another number, use the minus key.

Try pressing the plus key when the input line is empty. You'll get Ans+ in this case as well, The same with multiply and divide, among others, and for the same reason.

Sep 23, 2013 | Texas Instruments TI-84 Plus Calculator

1 Answer

Hi casio cash register, TE-2200 wont let me sign in. Tried the method of pressing the receipt key and turning the key to progrram and pressing sub total. It gives me reciet and again it does not let me...

That is not how you sign in.
Turn the key to REG mode.Type your sign in number. If no PIN numbers have been changed, the sign in is 1.Press the CLK# button.
If anyone needs more information, the Casio TE-2200 and TE-2400 manual is here:

May 12, 2012 | Casio Parts Cash Register PC Desktop

1 Answer

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.
[)] is the enclosing right parenthesis
[+/-] is the Sign Change key

May 06, 2010 | Casio FX-260 Calculator

1 Answer

What do i hit to make a number an negative

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...

2 Answers

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

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

1 Answer

How to perform log and - log function

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.

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

2 Answers

How do I input a mumber in scientific notation?

The structure of a number in scientific notation is as follows
one digit [decimal mark] several digits power of 10 (- sign if needed) up to two digits for the exponent.
d.ddddd [10^] (-) dd

To enter a number in scientific notation you need to use the [EXP] key, between the [.] and the [=] sign, on the bottom row of keys.

Ex: Avogadro's number (do not worry if you do not know what it represents)
Na= 6.02 x10 ^23
6.02 [EXP] 23 [=]

Electron charge 1.6 x10 ^(-19)
1.6 [EXP] [+/-] 19 [=]
The [+/-] key is the change sign key, in the first column of keys, between the fraction key [a b/c] and the [7] key

Jan 14, 2010 | Casio FX-260 Calculator

1 Answer

How do I ente 8x - 1 over 10 on my TI 84 plus silve edition

I am not sure what the cross (x) means: is it a multiplication or the variable x, so I took a screen capture of both cases.

The top case is obtained as follows the asterisk is the multiplication sign to thr right of digit 9; the small minus is the change sign key the minus sign in parentheses under digit 3 and to the left of ENTER key.; the forward slash is the division sign, above the multiplication sign.
This small minus called change sign makes a positive number negative and a negative number positive, hence its name. If your expression starts with a negative sign that is the one to use. Use it also for negative exponents.

As you can see the result is -.8. Notice how the - before the dot is small with respect to the regular minus, as in the last expression.

For the last expression on the screen capture, there is nothing special, except that you have two ways to enter the variable X.

1. Press [ALPHA] [STO->]
2. Press the key [X,T, Theta, n] to the right of the green [ALPHA] key.

Hope it helps.


If x is the multiplication sign
8[x] [(] (-)1

Oct 06, 2009 | Texas Instruments TI-84 Plus Calculator

2 Answers

Sharp er-a330 cash register

That's a programming option -- whether you have to sign in for each sale, or can just keep going until you do a Cashier Z reading. But this on is not in your Owner Manual. Most Sharpregisters have a deeper level of programming, called SRV mode. It's not marked on your mode switch, but it's one click past PGM. You need a SRV key to access it and a Service Manual to know what's there. Sharp doesn't supply the SRV key or instructions, because it allows you to change Grand Totals and other things that would allow an employee to steal without detection.

Any servicing Sharp register dealer should have the SRV key, and this change is simple enough that they might do it for free if you bring the register to them along with these instructions and ask nicely.

Turn to SRV mode.
910 . @/FOR CA/AT
Turn to REG mode.

Sign in and try running consecutive sales or No Sales without signing in between them.

You can still change Cashier numbers between sales by signing in with a different number.
If you touch the CASH # button without putting a number in first, it will sing out you current cashier, and you'll need to sign someone in again.
If you are in X/Z mode, and you touch the CASH # button, it will print a Cashier Z reading and automatically sign out all cashiers. Sign in before your next sale.

Good luck,

Sep 02, 2008 | Monroe 2020Plus Calculator

1 Answer

Symbols & number OVER Number Keys

The typewriter is in the keyboard ll position, hold down the code key while touching the KBll key (5)

Jun 03, 2008 | Nakajima AE-710 Typewriter

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