SCIENTIFIC CALCULATOR

11 Natural logarithms and the power of E using the calculator

Natural logarithms such as logarithms that are natural, for example, can be measured using any calculator using key key. The second function of this key ( ) permits the calculation of power that are equal to . Be aware that an approximate value for the key itself is determined using the key sequence ( ).

Remember that means the same as ln. Certain calculators use the key in place of .

Activity 20 Calculating natural logarithms and powers of e

Calculate the value of each of these using your calculator Give each of the three answers to three important figures.

The answer is revealed

12 Calculator reference guide

Calculator different modes

General types

The calculator can operate in several different modes:

  • COMP is a term used for general calculations
  • STAT, which is utilized to perform statistical calculations.
  • TABLE, which is employed to create tables of numbers.

COMP is a short form for 'computation', and STAT is the abbreviation for'statistics'..

Comp mode is set by the use of the keyboard sequence (COMP).

Mathematics modes

There are two methods where mathematics can be entered into and displayed on the calculator:

  • Math mode, in which fractions are entered into the program and displayed in their mathematical forms such as and some non-rational numbers are displayed as surds (such as ) or multiples of (such as ).Math mode can be chosen by selecting the keysequence (SETUP) (MthIO).
  • Linear mode, in which fractions such as are entered and displayed using a linear notation - for example, 2 3 - and all irrational numbers (such as and ) are displayed as decimal approximations.Linear mode is selected by using the key sequence (SETUP) (LineIO).

Put simply, an irrational number is one which cannot be expressed as a simple fraction.

You know that you are in Math mode if the word Math appears near the right hand side of the high-end of the calculator display. If this isn't displayed then you're in Linear mode.

In Math mode you can cause an answer to be displayed as a decimal , or you can toggle between the mathematical and decimal outputs with .

Fraction display modes

One can configure the calculator so that answers which are heavy on top (such in ) will be always presented using mixed numbers (such for ).

  • To change the calculator to display mixed numbers, use your keystroke (SETUP) (ab/c).
  • To set the calculator to display top-heavy fractions, use your key sequence (SETUP) (d/c).

Decimal display modes

The calculator can be set to show decimal numbers in different ways:

  • Normal 1 (Norm 1) mode makes use of scientific notation of any number smaller than 0.01 but greater than -0.01, and otherwise displays answers according to the decimal places they're located with the exception of the maximum number that will fit on the display. This mode can be entered by using (SETUP) (Norm) .
  • Normal 2 (Norm 2) mode employs scientific notation of any number that is less than 0.000000001 but over -0.000000001, but otherwise displays the answers for however many decimal points they have with the exception of the maximum number that is possible on the display. This mode is controlled by (SETUP) (Norm) .
  • Science notation (Sci) displays all decimal numbers in scientific notation with a specified number of significant figures. The mode is set by (SETUP) (Sci) followed by the number of significant figures that are required for instance . When you are using your calculator is set in this mode the indicator on your display is shown.
  • Fixed decimal place Mode with fixed decimal places (Fix) displays every decimal number to the specified quantity of decimal points (unless it is needed to match the result to the screen). This mode can be entered by (SETUP) (Fix) followed by the decimal number needed, such as . If you are using your calculator is set in this mode, it displays an indicator for FIX is displayed.

12.1 Display indicators

They are icons displayed in the calculator display to show its actual state of operation.

Symbol on display Meaning
A key was held.
This key has been press.
M A value is stored in the memory known as 'M'.
STO The key to store ( (STO)) is pressed.
RCL The RECALL ( ) key has been press.
The calculator is designed to measure angles in degrees.
The calculator is configured to measure angles measured in radians.
The calculator is programmed to measure angles in gradians.
FIX The calculator is set to display answers to a certain range of decimal numbers.
SCI The calculator will show the answers in scientific notation with a fixed number of significant figures.
Math It is important that the calculator has been set to utilize Math mode for the input as well as display.
STAT The calculator is in statistical mode.
There's more information available than can be displayed, and it is accessible by pressing the up/down keys.
The line that is displayed is much longer than it can be displayed on the screen. Other parts of the line are displayed by scrolling with the buttons for left and right: as well .

12.2 Common operations

To Key sequence
Turn on
Turn off (OFF)Note it is important to note that this calculator will automatically shut off if not used for about 6 minutes.
Modify the display's contrast (SETUP) () then use it and adjust, then press when completed.
Restore factory settings (CLR) (Setup) (Yes)
Clear the contents of all memories (CLR) (Memory) (Yes)
Restore the default settings , then clear all memories (CLR) (All) (Yes)
Cancel a calculation, or leave menus
Obtain an answer
You can get a decimal result in Math mode
Toggle between exact and decimal solutions in Math mode
Switch between showing fractions as mixed numbers or fractions that are incorrect in Math mode
Make use of the results of the previous calculation...
... e.g. to find 42 minus the previous result
A value is stored in memory with the letter 'M' (STO) (M)
Clear a value stored in the memory of M (STO) (M)
Add a value in the 'M' memory
Subtract a value from the one in the memory of 'M'. (M-)
Display the value stored in the 'M' memory (M)
Utilize the value of the memory "M" in calculations...
... e.g. to find 42 minus the memory of 'M'. (M)
Set angles that will be measured using degrees (SETUP) (Deg)
Be sure to measure angles measured in radians (SETUP) (Rad)
Set answers to be displayed to 3 decimal places (To utilize a different number of decimal place, replace with the number) (SETUP) (Fix)
Answers to questions are displayed in scientific notation , with three significant figures (To select a different amount of important figures replace the number with the one you want to use.) (SETUP) (Sci)
You can cancel any settings for display rounding. (SETUP) (Norm)

The A B, C, D and X and Y memories are utilized in the same way as the M memory, except that they lack subtracting or adding from' functions.


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