SCIENTIFIC CALCULATOR

11 Natural logarithms and the powers of e in your calculator

Natural logarithms, like are able to be calculated using you calculatorusing using the key. Keys have two functions. key ( ) allows for the calculation of power for . It is important to note that an approximate value for its own value can be determined using the key sequence ( ).

Be aware that means the same thing as. Certain calculators come with a key rather than .

Activity 20 Calculating natural logarithms and the powers of e

Determine the value of each of these with your calculator and then give each answer to 3 significant figures.

Find the answer

12 Calculator reference guide

Calculator uses various modes

General modes

The calculator can be used in many different modes:

• COMP, which is used to perform general calculations.
• STAT is a program utilized for statistical calculations.
• TABLE is a tool used to create tables using numbers.

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

Comp mode is selected by making use of the keys sequence (COMP).

Mathematics models

There are two possible ways in which mathematics can be input to and displayed on the calculator:

• Math mode, where fractions are entered and displayed in their proper mathematical form For instance, some numbers that are not mathematical appear as surds (such as ) or multiples of (such as ).Math mode can be chosen 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).

Simply put, an irresponsible number is one which cannot be expressed as a straightforward fraction.

It is obvious that you are in Math mode if the word Math appears on the right-hand uppermost part of your calculator display. If it isn't then you're in Linear mode.

In Math mode you can cause the answer to display as a decimal the decimal option, and you can toggle between the mathematical and decimal outputs with .

Fraction display modes

There is the option to configure the calculator so that answers which are top-heavy fractions (such for ) are always displayed using mixed numbers (such in ).

• To make your calculator to display mixed numbers, use the key sequence (SETUP) (ab/c).
• To configure the calculator to display as top-heavy fractions, follow the sequence key (SETUP) (d/c).

Decimal display modes

The calculator is able to display decimal numbers in many different ways:

• Normal 1 (Norm 1) mode employs scientific notation of any number smaller than 0.01 but higher than -0.01 and displays answers according to the decimal locations they can be within the limits that is possible on the display. The mode is controlled by (SETUP) (Norm) .
• Normal 2 (Norm 2) mode makes use of scientific notation of any number that is less than 0.000000001 but over -0.000000001 However, it also displays the answers for however many decimal points they have, subject to the maximum that can be accommodated on the screen. This mode can be entered by using (SETUP) (Norm) .
• Scientistic notation mode (Sci) displays every decimal number in scientific notation by using the specified number of important figures. This mode can be entered by using (SETUP) (Sci) followed by the number of significant figures required for instance . If your calculator is in this mode, the indicator on your display is shown.
• Fixed decimal place mode (Fix) displays all decimal numbers within the given quantity of decimal points (unless it is required to match the result to the display). This mode is activated by using (SETUP) (Fix) followed by the decimal number required, for example . If your calculator is in this mode, you will see the indicator on your display. FIX is displayed.

12.1 Display indicators

They are icons displayed upon the calculator display to indicate its status at present.

Symbol on display	Meaning
	It appears that the key has been hit.
	The key was released.
M	The value is stored in the 'M' memory.
STO	The STORE key ( (STO)) was activated.
RCL	The RECALL ( ) key was activated.
	The calculator is calibrated to measure angles in degrees.
	The calculator is designed to measure angles in Radians.
	The calculator is calibrated to measure angles in Gradians.
FIX	The calculator is set to display answers to a fixed the number of decimal positions.
SCI	The calculator is set to show the answers in scientific notation . some fixed numbers of relevant figures.
Math	It is important that the calculator has been set to make use of Math mode to both input and output.
STAT	The calculator is in the statistics mode.
	There is more information available than is displayed and you can access it by using the up and down cursor keys.
	The displayed line is longer than can fit on the screen. Other parts of the line are shown by scrolling the left and right mouse keys and .

12.2 Common operations

To	Key sequence
Turn on
Turn off	(OFF)Note this calculator will automatically turn off after 6 minutes.
Set the display's contrast.	(SETUP) () Then use the settings and modify, and press when complete.
Restore the 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)
Cancel a calculation or leave menus
Find an answer
Get a decimal solution in Math mode
Switch between decimal and exact answer options in Math mode
Switch between showing fractions as mixed numbers or improper fractions in Math mode
Apply the result of the previous calculation...
... e.g. to find 42 times the previous result.
Save a value to the memory 'M'	(STO) (M)
Clear a value in the memory of M	(STO) (M)
Input a value in the memory 'M'
Subtract a number from that in the 'M' memory	(M-)
Display the value stored in the memory 'M'.	(M)
Use the value in the memory 'M' in a calculation...
... e.g. to find 42 minus the number in the memory "M"	(M)
The angles that are which will then be measured as degrees	(SETUP) (Deg)
Be sure to measure angles measured in Radians	(SETUP) (Rad)
Set the answer to be displayed with 3 decimal points (To make use of a different number of decimal places, substitute with the number)	(SETUP) (Fix)
Set answers to be shown in scientific notation with 3 significant figures (To select a different amount of important figures replace the figure with the appropriate 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, with the exception that they are not able to perform addition or subtract from' functions.