Casio FX-115MS: Problem with the complex invoice

Typical problems when using the technical Casio computer

• To deal with complex Counting To be able to calculate, you need to set the Casio FX-115MS to the correct mode. "CMPLX" must be visible in the display. Press [Mode] and [2] to enter the mode.
• Important: The angle unit must be set to "DEG" (old degree, right angle is 90 °). Press the [Mode] button 4 times. This is the most common mistake made, the angle unit is not set.
• Variables D, E, F, X and Y cannot be used in complex mode. Limit yourself to the variables A, B, C and M.
• The result is displayed in the mode that only the real or only the imaginary is displayed or only the absolute value or the angle unit. You will see the message "R I" or a lowercase r, the angle sign and phi. Press [Shift] and [Re Imp] to see the other part of the result.

Easy exercises with the FX-115MS

1. In order to practice using the computer and at the same time to test whether the Casio FX-115MS is malfunctioning, you should calculate simple tasks, the results of which are known to you.


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2. First calculate (1 + 3i) + (2 + 1i) by pressing the [1] [+] [3] [i] [+] [2] [+] keys in the mode that you have set as described. Press [1] [i] [=]. You will then see a 3 (real part) and the message "R I" in the display. Now press [Shift] and [Re Imp]. You will now see the display 4i.
3. Now press the [Shift] key and the key on which the symbol r Winkel Phi can be seen. You will now see a 5 in the display (the absolute) and, after you have pressed [Shift] and [Re Imp], 53.13... (Angle).
4. Cross-check by pressing [Shift] and [a + bi]. Now 3 + 4i must be visible again.

If your computer comes out differently, check whether you are in the correct mode and whether you have set the correct angle. If you are sure that you have not made a mistake, contact Casio, then the calculator has a defect.