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How to Put Absolute Value in Calculator Fx-991es Plus

Reviewed by Calculator Editorial Team

The Casio FX-991ES Plus scientific calculator is a powerful tool for students and professionals. One of its essential functions is calculating absolute values, which is crucial in mathematics, physics, and engineering. This guide will walk you through the process of putting absolute value on your FX-991ES Plus calculator.

Introduction

The absolute value of a number is its distance from zero on the number line, regardless of direction. It's always non-negative. The FX-991ES Plus provides a straightforward way to calculate absolute values using its built-in functions.

Understanding how to use the absolute value function is essential for solving equations, analyzing data, and performing various mathematical operations. This guide will show you how to access and use this function on your FX-991ES Plus calculator.

Steps to Calculate Absolute Value

Calculating absolute value on the FX-991ES Plus is a simple process. Follow these steps to perform the calculation:

  1. Turn on your FX-991ES Plus calculator.
  2. Press the "AC" button to clear any previous calculations.
  3. Enter the number for which you want to find the absolute value.
  4. Press the "SHIFT" button.
  5. Press the "ABS" button (located near the "x^2" button).
  6. The calculator will display the absolute value of the entered number.

Tip

If you're working with negative numbers, the absolute value function will convert them to positive numbers. For example, the absolute value of -5 is 5.

Worked Examples

Let's look at a few examples to illustrate how to use the absolute value function on your FX-991ES Plus calculator.

Example 1: Positive Number

Find the absolute value of 10.

  1. Enter "10" on the calculator.
  2. Press "SHIFT" followed by "ABS".
  3. The result will be "10".

Example 2: Negative Number

Find the absolute value of -7.

  1. Enter "-7" on the calculator.
  2. Press "SHIFT" followed by "ABS".
  3. The result will be "7".

Example 3: Zero

Find the absolute value of 0.

  1. Enter "0" on the calculator.
  2. Press "SHIFT" followed by "ABS".
  3. The result will be "0".

Absolute Value Formula

The absolute value of a number x is defined as:

Formula

|x| = x if x ≥ 0

|x| = -x if x < 0

This formula shows that the absolute value of a number is the number itself if it's positive or zero, and the negative of the number if it's negative.

The FX-991ES Plus calculator uses this formula internally to compute absolute values. Understanding this formula can help you verify the results you get from the calculator.

Frequently Asked Questions

Can I use the absolute value function with decimal numbers?

Yes, the absolute value function on the FX-991ES Plus works with both integers and decimal numbers. You can enter any number, positive or negative, and the calculator will return its absolute value.

What happens if I try to find the absolute value of a complex number?

The FX-991ES Plus calculator does not support complex numbers. If you attempt to find the absolute value of a complex number, the calculator will display an error message.

Is there a way to find the absolute value of a variable?

No, the absolute value function on the FX-991ES Plus calculator only works with numerical values. You cannot use it with variables or expressions.

Can I use the absolute value function in a calculation involving multiple steps?

Yes, you can use the absolute value function as part of a larger calculation. Simply enter the numbers and operations, then use the absolute value function when needed.