Casio FX 991 ES - How to use important functions

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Have you misplaced the manual for your Casio FX 991 ES? You can find out important functions such as saving and outputting values ​​as well as calculating matrices without instructions.

This is how you can perform useful functions with your calculator.
This is how you can perform useful functions with your calculator.

How to save and output values ​​on the Casio FX 991 ES

As soon as you find yourself in a complex calculation step and have to temporarily store several values, you have the option of using the internal memory of your Casio FX 991 ES.

  1. First you calculate the first part of your calculation step. For example 3.5² x 3.5³.
  2. If you now need the calculated value for further calculation, save it. To do this, select the "Shift" key located on your calculator at the top left and then press the “Sto” button located above the “7”.
  3. Now you can use one of the four memory locations, ie the letters “A” to “D”, these are in turn located above the “Sto button”. The value is now saved on the pressed letter.
  4. To output the saved value again and use it for your further calculation, press First the "RCL button" above the "7" and then the letter on which you have saved the value.
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  5. This last step would look like this, for example; "RCL key", letter "A" x 5.

You can save up to four values ​​that you need to continue calculating.

This is how you can calculate matrices on your calculator

Another very useful function of the Casio FX 991 ES is the calculation of Matrices. You can calculate matrices up to a format of 3x3.

  1. First you have to select the matrix mode. To do this, press the “Mode / Setup button”, then the “6” button and then the “1” to enter matrix A.
  2. Now you can choose the format of your matrix, for example press "5" to enter the values ​​of a 2x2 matrix.
  3. Now enter the Counting the matrix. To get to the next "field", press the "equal sign" after entering a number.
  4. Then press the "AC button".
  5. Now you have to enter the second matrix. To do this, first go to “matrix mode” by pressing the “shift key” and then pressing the “4” key.
  6. Now press "1" and select matrix B by pressing "2".
  7. Now you can again select the format of the matrix, for example press "6" here.
  8. Now enter the individual values ​​as described above and then click on the "AC" button.
  9. In order to be able to calculate a multiplication of both matrices, for example, you have to go back to the Go to matrix mode and select matrix A, you can do this with the key sequence “Shift”, “4” and “3”.
  10. Now press the multiplication key and then enter the second matrix using the key sequence “Shift”, “4” and “4”.
  11. Finally, you need to press the equals sign on your calculator to display the result.

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