SCIENTIFIC CALCULATOR

11 Natural logarithms and the powers of E in your calculator

Natural logarithms like those, for example are able to be measured using the calculatorusing using the key. The other function of this key ( ) permits the calculation of power in the form of . Note that an approximate value for the key itself is determined using the key sequence ( ).

Be aware that refers to that it is the same as. Some calculators feature the key rather than .

Activity 20 Calculating natural logarithms and the powers of E

Calculate the amount of each of these with your calculator by submitting each answer to 3 significant figures.

Get the answer

12 Calculator reference guide

Calculator uses various modes

General modes

The calculator operates in many different modes:

  • COMP is a term used for general calculations
  • STAT is a statistical program that can be used to calculate statistics.
  • TABLE, which is used to build tables from numbers.

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

Comp mode is chosen by using the key sequence (COMP).

Mathematics-related modes

There are two ways to input maths entered into and displayed on the calculator:

  • Math mode, where fractions can be entered and displayed in their mathematical forms - for example, and some non-rational numbers appear as surds (such as ) or multiples of (such as ).Math mode is set by making use of the keyboard sequence (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).

In simple terms, an irrational number is one that is unable to be represented as a simple fraction.

You will know you are in Math mode when the word Math is displayed near the right-hand high-end of the calculator display. If it's not that means you're in Linear mode.

In Math mode you can cause the answer to display as a decimal using an option or you can toggle between the mathematical and decimal outputs by .

Fraction display modes

It is possible to configure the calculator so that answers that are heavy on top (such such as ) is always presented by way of mixed numbers (such in ).

  • To make the calculator to display as mixed numbers, you must use your keystroke (SETUP) (ab/c).
  • To set the calculator to display as top-heavy fractions, use to set the keysequence (SETUP) (d/c).

Decimal display modes

The calculator can be configured to display decimal numbers in various different ways:

  • Normal 1 (Norm 1) mode employs scientific notation for any number that is less than 0.01 but higher than -0.01 and provides answers to whatever decimal locations they can be within the limits that will fit on the screen. This mode is entered using (SETUP) (Norm) .
  • Normal 2 (Norm 2) mode makes use of scientific notation of any number that is less than 0.000000001 but greater than -0.000000001 but provides answers to whatever decimal places they have up to the maximum that will fit on the display. This mode is activated using (SETUP) (Norm) .
  • Scientific notation mode (Sci) displays the decimal number in scientific notation using the number of significant figures. This mode is entered using (SETUP) (Sci) followed by the amount of significant figures needed, for example . If your calculator is set in this mode, the indicator on your display is shown.
  • Fixed decimal-place mode (Fix) displays every decimal number to a specified number of decimal places (unless scientific notation is needed to make the results fit on the screen). This mode can be set using (SETUP) (Fix) followed by the decimal number needed, such as . When your calculator is in this mode, there is a display indication FIX will be displayed.

12.1 Display indicators

The symbols are displayed across the calculator display to indicate the actual state of operation.

Symbol on display Meaning
It appears that the key was hit.
The key was pressed.
M A value is recorded in the 'M' memory.
STO The"STORE" key ( (STO)) is pressed.
RCL The RECAL ( ) key was pressed.
The calculator is configured to measure angles in degrees.
The calculator is configured to measure angles measured in radians.
The calculator is designed to measure angles in Gradians.
FIX The calculator will display answers to a fixed amount of decimal points.
SCI The calculator is set to give answers in scientific notation . a fixed number of significant figures.
Math The calculator will use Math mode for entry and displays.
STAT The calculator is currently in statistics mode.
There's more info available than is displayed and this can be accessed by using the up and down cursor keys.
The line that is displayed is more than what is possible to fit on the screen. Other segments of the line are displayed by scrolling using the buttons for left and right: or .

12.2 Common operations

To Key sequence
Turn on
Turn off (OFF)Note this calculator will turn off automatically if not used for about 6 minutes.
Set the display's contrast. (SETUP) () then use it and adjust, and press when completed.
Restore factory settings (CLR) (Setup) (Yes)
Clean the contents of all memories (CLR) (Memory) (Yes)
Restore the default settings , and then erase any memory (CLR) (All) (Yes)
Refuse to calculate a number, or quit menus
Find out the answer
Obtain a decimal answer in Math mode
Switch between decimal and exact answers in Math mode
Toggle between displaying fractions as mixed numbers or as improper fractions in Math mode
Use the result of the previous calculation...
... e.g. to find 42 minus the previous result
Record a value in Memory 'M' (STO) (M)
Clear a value in the M memory (STO) (M)
Create a new value in the 'M' memory
Subtract the value of in the memory of 'M'. (M-)
Display the value that is stored in the memory of 'M'. (M)
Utilize the number in the 'M' memory in the course of calculating...
... e.g. to find 42 minus the memory 'M' (M)
Set angles which will then be measured as degrees (SETUP) (Deg)
Determine angles which will be measured using radians (SETUP) (Rad)
Set the answers presented in three decimal places (To use a different number of decimal places, substitute with the number) (SETUP) (Fix)
Set the answers to be displayed in scientific notation , with three significant figures (To utilize a different number of important figures replace by that number) (SETUP) (Sci)
Cancel any display rounding settings (SETUP) (Norm)

The A, B, C, D, and X and Y memories are used similarly to the M memory, except that these have no add-to' and subtract from' functions.


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