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How to Put Negative Number in Calculator Casio Fx-115es Plus

Reviewed by Calculator Editorial Team

The Casio FX-115ES Plus is a versatile scientific calculator that handles both positive and negative numbers with ease. This guide explains how to properly input negative numbers and use them in calculations.

How to Enter Negative Numbers

Entering negative numbers on the Casio FX-115ES Plus is straightforward. Follow these steps:

  1. Press the negative sign button (-) located on the top row of the calculator.
  2. Enter the number you want to make negative.
  3. Press the equals (=) button to display the result.

Tip: The negative sign button is the same one used for subtraction. Make sure you press it before entering the number, not after.

For example, to enter -5:

  1. Press the negative sign (-) button.
  2. Press the 5 button.
  3. Press the equals (=) button to see -5 displayed.

Using Negative Numbers in Calculator Functions

The Casio FX-115ES Plus supports negative numbers in all basic arithmetic operations and scientific functions. Here's how to use them:

Basic Arithmetic

For operations like addition, subtraction, multiplication, and division, simply enter the negative numbers as shown above.

Example: -3 + 5 = 2

Example: -8 × 4 = -32

Scientific Functions

For scientific functions like square roots, logarithms, and trigonometric functions, negative numbers can be used when appropriate.

Example: √(-9) = Error (not a real number)

Example: sin(-45) = -0.7071

Statistical Calculations

Negative numbers can be used in statistical functions like mean, standard deviation, and correlation.

Example: Mean of -2, 0, 2 = 0

Example: Standard deviation of -1, 1, 1 = 0.8165

Common Mistakes and How to Avoid Them

When working with negative numbers on the Casio FX-115ES Plus, these common mistakes can occur:

  1. Forgetting to press the negative sign before entering a number.
  2. Using the negative sign after entering a number (this performs subtraction).
  3. Attempting to calculate square roots of negative numbers (which are not real numbers).

Remember: The negative sign must be pressed before entering the number. If you accidentally press it after, the calculator will perform subtraction instead.

Worked Examples

Here are some practical examples of using negative numbers on the Casio FX-115ES Plus:

Example 1: Temperature Conversion

Convert -5°C to Fahrenheit:

  1. Press the negative sign (-).
  2. Enter 5.
  3. Press the × button.
  4. Press 9.
  5. Press the ÷ button.
  6. Enter 5.
  7. Press the + button.
  8. Enter 32.
  9. Press the = button.

The result should be 23°F.

Example 2: Financial Calculation

Calculate the difference between -$200 and $300:

  1. Press the negative sign (-).
  2. Enter 200.
  3. Press the + button.
  4. Enter 300.
  5. Press the = button.

The result should be 100.

Example 3: Scientific Calculation

Calculate the sine of -90 degrees:

  1. Press the negative sign (-).
  2. Enter 90.
  3. Press the shift button.
  4. Press the sin button.
  5. Press the = button.

The result should be -1.

FAQ

How do I enter a negative number on my Casio FX-115ES Plus?
Press the negative sign button (-) before entering the number. For example, to enter -5, press the negative sign button followed by 5.
Can I use negative numbers in all functions on the FX-115ES Plus?
Yes, the FX-115ES Plus supports negative numbers in all basic arithmetic operations, scientific functions, and statistical calculations.
What happens if I forget to press the negative sign?
The calculator will treat the number as positive. To correct this, press the clear (C) button and re-enter the number with the negative sign.
Can I calculate the square root of a negative number?
No, the square root of a negative number is not a real number. The calculator will display an error message.
How do I clear a negative number from the display?
Press the clear (C) button to remove the current entry. If you want to clear the entire calculation, press the all clear (AC) button.