20 Most Recent Casio Brand New-Fx-991es Plus - Scientific Calculator - Page 8 Questions & Answers

First solve the problem by hand. Once you understand the solution it would be easier for you to implement it.

When it is time for you to put an expression in absolute value, press the OPTN key, then F5/Num, then F1/Abs. Open parenthesis, input expression, then close parenthesis. For fractions, use the key with the symbol a b/c. A little friendly advice, please do invest some of your time reading the manual. Most Casio graphing calculators work the same way. What you learn on one, works on another.

With a number displayed, pressing the M+ key adds the displayed number to the contents of the running memory, and stores the result. Pressing the M- key subtracts the displayed number from the memory and stores the result in the running memory.

Choose the computational mode as Standard Deviation or Statistics, Enter your values and press the keys x_bar or other to get the measures you are looking for.

Enter the number in the correct units (degrees or radians) press the key for the function you want and get the result.

Any chance the ribbon is installed upside down?

I have searched casio and various old manual sites and at this point have found the following manual to be as close to what you are looking for among a multitude of variations. It is not a problem to find a manual to a FX-82C or FX-82AU but the A variation has eluded me: http://casio.edu.monacocorp.co.nz/products/fx82ausplus/pdf/Using_2082AU_20PLUS_20manual.pdf Notice that this comes from a New Zealand site. It makes me wonder if AU might relate to Australia. Only Casio support would know for sure.

Here is a user guide that should prove beneficial. I hope it helps. http://support.casio.com/en/manual/004/fx-300ES_PLUS_EN.pdf

Press SHIFT MODE 8 2 to select the Norm2 display mode.Be aware that the calculator will switch to scientific notation if the magnitude of the number goes above 10^10 or below 10^-9.

http://support.casio.com/pdf/004/fx115MS_991MS_E.pdf copy and paste this address into your browser's address window and download the owner's manual

Casio has most of their calculator and adding machine manuals available here: http://support.casio.com/en/manual/manuallist.php?cid=004 . Select Printing Calculators in the first drop-down menu. Then select the HR-100TM/HR-150TM in the second drop-down menu. Press the Search button. This should get you to the product support page: http://support.casio.com/en/manual/manualfile.php?cid=004016014 . The direct link to the user manual is currently http://support.casio.com/en/manual/004/HR-100TM_HR-150TM_WC_EN.pdf . I hope this helps. Cindy Wells