SCIENTIFIC CALCULATOR

11 The natural logarithms as well as the powers of E to your calculator

Natural logarithms for instance they can be assessed on your calculator using keys. For example, the key. The other function of this key ( ) is to allow the calculation of power for . Note that an approximate value for its own value can be found by using the key sequence ( ).

Be aware that is the same as ln. Some calculators feature the key as an alternative to .

20. Calculating natural logarithms and powers of e

Calculate the amount of each of the following numbers using your calculator, giving each answer to three significant figures.

Answer the question

12 Calculator reference guide

Calculator has different modes

General methods

The calculator operates in many different modes:

• COMP, which is used to do general calculations.
• STAT is a program used to calculate statistical data.
• TABLE, which is used for generating tables of numbers.

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

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

Mathematics and mathematics modes

There are two different ways in which mathematics can be entered into and displayed on the calculator:

• Math mode, in which fractions can be entered and displayed in their mathematical format such as or some odd numbers can be displayed in 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).

Simply put, an irresponsible number is one that is unable to be expressed in terms of a simple fraction.

You will know you're in Math mode if the word Math is visible on the right hand side of the highest point of the calculator display. If it isn't then you're in Linear mode.

In Math mode it is possible to force an answer to be displayed as a decimal using the decimal option, and switch between the mathematical and decimal outputs using .

Fraction display modes

It is possible to configure the calculator so that answers that are heavy on top (such in ) can be always displayed as mixed numbers (such such ).

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

Decimal display modes

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

• Normal 1 (Norm 1) mode makes use of scientific notation for numbers less than 0.01 but greater than -0.01, and otherwise shows answers for whatever decimal places they have up to the maximum that can fit on the display. This mode can be accessed via (SETUP) (Norm) .
• Normal 2 (Norm 2) mode uses scientific notation for any number less than 0.000000001 but higher than -0.000000001 However, it also displays the answers for however many decimal locations they are available up to the maximum that can fit on the display. This mode is controlled by (SETUP) (Norm) .
• Scientific notation mode (Sci) displays the decimal number in scientific notation with the specified number of important figures. This mode can be set using (SETUP) (Sci) followed by the quantity of significant figures required for instance . If you are using your calculator is in this mode, the display indicator SCI appears displayed.
• Fixed decimal point Mode with fixed decimal places (Fix) displays all decimal numbers within the given the number of decimal decimal positions (unless the use of scientific notation needed to fit the result on the screen). This mode can be entered by (SETUP) (Fix) followed by the number of decimal places required, for example . If your calculator is set in this mode the display indicator FIX is shown.

12.1 Display indicators

These are the symbols displayed by the calculator display to indicate the status at present.

Symbol on display	Meaning
	The key was released.
	This key was hit.
M	The value is stored in the memory known as 'M'.
STO	The key STORE ( (STO)) has been held.
RCL	The RECALL ( ) key was hit.
	The calculator is programmed to measure angles measured in degrees.
	The calculator is set to measure angles in Radians.
	The calculator is configured to measure angles using Gradians.
FIX	The calculator is set to show responses to a specified range of decimal numbers.
SCI	The calculator will show answers in scientific notation with an undetermined number of important figures.
Math	The calculator should utilize Math mode for input and display.
STAT	The calculator is in statistics mode.
	There is more information available that can be displayed and it is accessible through the up and down keys.
	The line displayed is longer than it can be displayed on the display. Other segments of the line can be displayed by scrolling with the left and right keys for the cursor: as well .

12.2 Common operations

To	Key sequence
Turn on
Turn off	(OFF)Note in that calculator will automatically shut off after 6 minutes.
Set the display's contrast.	(SETUP) () then use it and adjust, then press when finished.
Restore the factory settings	(CLR) (Setup) (Yes)
Clean the contents of all memories	(CLR) (Memory) (Yes)
Restore the default settings , then clear all of the memories	(CLR) (All) (Yes)
Make a calculation unchangeable, or get rid of menus
Obtain an answer
Calculate a decimal number in Math mode
Switch between decimal and exact responses in Math mode
Switch between showing fractions as mixed numbers or incorrect fractions in Math mode
Utilize the results of your previous calculations...
... e.g. to find 42 times the previous result
Record a value in memory with the letter 'M'	(STO) (M)
Clear a value stored in the memory of M	(STO) (M)
Add a value in the memory of 'M'
Subtract a value from that in the 'M' memory	(M-)
Display the value that is stored in the memory 'M'.	(M)
Utilize the value stored in the 'M' memory in the calculation...
... e.g. to find 42 minus the memory "M"	(M)
Set angles to measure in degrees	(SETUP) (Deg)
Determine angles which will be measured using radians	(SETUP) (Rad)
Set the answers to be displayed according to 3 decimal place (To use a different number of decimal place, replace with the number)	(SETUP) (Fix)
Set the answers to be displayed in scientific notation with 3 significant figures (To make use of a different number that is significant, 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, X and Y memories are used similarly to those of the M memory, except that they are not able to perform add-to' and subtract from' functions.