Question about Casio FX991MS Scientific Calculator

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I can t find the +/- key as I need to input a negative number

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Use the key marked "(-)", two keys up from the "7" key.

Posted on May 17, 2011

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I have a TI-86, whenever i input - it shows Ans- and then it show that is an error. how can i fix it.


The - key is for subtraction, an operation that needs two numbers. If you press - as the first key on a line, the calculator assumes you want to subtract something from the previous answer, Ans.

If you want to enter a negative number, use the (-) key on the bottom row of the keyboard, just to the left of the Enter key.

Apr 05, 2016 | Texas Instruments TI-86 Calculator

1 Answer

I have a possible glitch on the Sharp EL-531X calculator. If I use the negative (+/-) key BEFORE hitting enter, the number is made negative as it should be. But for whatever reason, AFTER I hit enter, it...


I doubt that it has a glitch. Although possible, it is not very probable. Try to use the calculator correctly.
Follow the algebraic logic.
If you did not input any value the answer memory contains the value 0.
When you press (+/-) followed by [=] it takes the value in answer memory and negates it, thus giving you (-0).
Adopt a consistent way of inputting numbers, namely always enter the negation sign before the number that is negated. The calculator will enclose the negated number between parentheses, which prevents may errors. Too bad this feature has not been kept in more recent calculators by Sharp.

Dec 04, 2013 | Office Equipment & Supplies

1 Answer

I have a possible glitch. If I use the negative (+/-) key BEFORE hitting enter, the number is made negative as it should be. But for whatever reason, AFTER I hit enter, it displays only -0. If I hit...


I doubt that it has a glitch. Although possible, it is not very probable. Try to use the calculator correctly.
Follow the algebraic logic.
If you did not input any value the answer memory contains the value 0.
When you press (+/-) followed by [=] it takes the value in answer memory and negates it, thus giving you (-0).
Adopt a consistent way of inputting numbers, namely always enter the negation sign before the number that is negated. The calculator will enclose the negated number between parentheses, which prevents may errors. Too bad this feature has not been kept in more recent calculators by Sharp.

Dec 04, 2013 | Office Equipment & Supplies

1 Answer

I have a possible glitch. If I use the negative (+/-) key BEFORE hitting enter, the number is made negative as it should be. But for whatever reason, AFTER I hit enter, it displays only -0. If I hit...


I doubt that it has a glitch. Although possible, it is not very probable. Try to use the calculator correctly.
Follow the algebraic logic.
If you did not input any value the answer memory contains the value 0.
When you press (+/-) followed by [=] it takes the value in answer memory and negates it, thus giving you (-0).
Adopt a consistent way of inputting numbers, namely always enter the negation sign before the number that is negated. The calculator will enclose the negated number between parentheses, which prevents may errors. Too bad this feature has not been kept in more recent calculators by Sharp.

Dec 04, 2013 | Office Equipment & Supplies

1 Answer

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

How do i multiply two negatives to get a positive figure? eg. -4.5 and -1. I tried and got -4.5 which i know is incorrect.


Make sure you use the +/- key (just to the right of the decimal point) to input negative numbers.

Press +/- 4 . 5 * +/- 1 . 1 =

Jul 05, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

How would you do negative exponents for scientific notation? example: (6.0 x 10^6)(2.0 x 10^4), I am required to use the EE button for my exponents since it's a scientific notation equation but I do not...


Use the (-) key for negative numbers (not just exponents) instead of the - key. The - is to subtract one value from another, (-) is to input a negative value.

Sep 09, 2010 | Texas Instruments TI-30XA Calculator

1 Answer

How do i input a negative exponent on my ti30x IIs


Use the EE (enter exponent) key (2nd-shift of the key just above the 7) to enter the exponent. Use the (-) key just to the right of the decimal point to enter a negative number.

The - key subtracts one number from another. The (-) key enters a negative number.

Jun 29, 2010 | Texas Instruments TI-30 XIIS Calculator

1 Answer

How do you input -log ?


Use the log function (common logarithm). See screen capture for markings on key.
83c0b62.jpg
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) .

Jun 01, 2010 | Casio FX-260 Calculator

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