HP 48gII Calculations with real numbers, Chapter, 2.5, Y2`, 4`Y, \2.5`, 3.7+5.2`, 6.3-8.5`, 4.2*2.5`, 2.3/4.5`, 3.7` 5.2+, Examples of real number calculations

Chapter 3

Calculations with real numbers

This chapter demonstrates the use of the calculator for operations and functions related to real numbers. The user should be acquainted with the keyboard to identify certain functions available in the keyboard (e.g., SIN, COS, TAN, etc.). Also, it is assumed that the reader knows how to change the calculator’s operating system (Chapter 1), use menus and choose boxes (Chapter 1), and operate with variables (Chapter 2).

Examples of real number calculations

To perform real number calculations it is preferred to have the CAS set to Real (as opposed to Complex) mode. Exact mode is the default mode for most operations. Therefore, you may want to start your calculations in this mode. Some operations with real numbers are illustrated next:

•Use the \key for changing sign of a number.

For example, in ALG mode, \2.5`.

In RPN mode, e.g., 2.5\.

•Use the Ykey to calculate the inverse of a number. For example, in ALG mode, Y2`.

In RPN mode use 4`Y.

•For addition, subtraction, multiplication, division, use the proper operation key, namely, +-*/.

Examples in ALG mode:

3.7+5.2`6.3-8.5`4.2*2.5`2.3/4.5`

Examples in RPN mode:

3.7` 5.2+

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