SCIENTIFIC CALCULATOR

11 Logarithms that are natural and powers of e to the calculator

Natural logarithms, for example could be measured on the calculator using keys. For example, the key. The other function of this key ( ) allows for the calculation of powers for . The approximate value for the key itself is obtained using the key sequence ( ).

Be aware that is the same as ln. Certain calculators use keys instead of key instead of .

20. Calculating natural logarithms and the powers of E

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

Reveal answer

12 Calculator reference guide

Calculator has different modes

General methods

The calculator is able to operate in a variety of different modes:

• COMP is a term used to perform general calculations.
• STAT is a statistical program that can be used to calculate statistical data.
• TABLE is a tool used to create tables using numbers.

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

The Comp mode can be selected using the key sequence (COMP).

Mathematics modes

There are two methods of displaying math input into and displayed on the calculator:

• Math mode, where fractions are entered , and then displayed in their mathematically correct form For instance, and some non-rational numbers appear as surds (such as ) or multiples of (such as ).Math mode is selected by following the sequence of keys (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 irrational number is one which cannot be expressed in a simple fraction.

You will know you're in Math mode if the word Math is shown near the right hand side of the top of the calculator display. If this is not shown the word Math, then you're using Linear mode.

In Math mode it is possible to force the answer to display as a decimal using your keyboard, or toggle between decimal and mathematical outputs with .

Fraction display modes

There is the option to configure the calculator so that answers that are top-heavy fractions (such for ) is always shown as mixed numbers (such such ).

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

Decimal display modes

The calculator can be programmed to display decimal numbers in many different ways:

• Normal 1 (Norm 1) mode employs scientific notation of any number smaller than 0.01 however greater than -0.01 in other cases, and also shows answers for whatever decimal places they are within the limits that is possible on the display. The mode is activated using (SETUP) (Norm) .
• Normal 2 (Norm 2) mode makes use of scientific notation for any number smaller than 0.000000001 but larger than -0.000000001 however, it shows the answer to as many decimal places they can be, subject to the maximum that will fit on the screen. The mode can be accessed via (SETUP) (Norm) .
• Scientistic notation mode (Sci) displays the decimal number in scientific notation by using an arbitrary number of relevant figures. The mode is set by (SETUP) (Sci) followed by the number of significant figures required for example . If you are using your calculator is set in this mode the display indicator SCI is shown.
• Fixed decimal-place modes (Fix) displays all decimal numbers in a given amount of decimal spaces (unless the use of scientific notation needed to fit the result on the display). The mode is set by (SETUP) (Fix) followed by the number of decimal places needed, such as . When your calculator is set in this mode the display indicators FIX is displayed.

12.1 Display indicators

The symbols are displayed upon the calculator display to show its status at present.

Symbol on display	Meaning
	This key has been hit.
	This key was held.
M	The value is stored in the memory known as 'M'.
STO	The"STORE" key ( (STO)) is press.
RCL	The RECAL ( ) key was held.
	The calculator is set to measure angles in degrees.
	The calculator is configured to measure angles measured in radians.
	The calculator is configured to measure angles using gradians.
FIX	The calculator is set to display the answers according to a set the number of decimal positions.
SCI	The calculator is set to show answers in scientific notation with the same number of important figures.
Math	The calculator is set to use Math mode to data input, and for display.
STAT	The calculator is in the statistics mode.
	There's more information available than is displayed and you can access it through the up and down keys.
	The displayed line is longer than it can be displayed on the screen. Other lines are displayed using scrolling buttons for left and right: and .

12.2 Common operations

To	Key sequence
Turn on
Turn off	(OFF)Note that the calculator will turn off automatically when it is not used for approximately 6 minutes.
Set the display's contrast.	(SETUP) () then use it and adjust, and then press when finished.
Restore factory settings	(CLR) (Setup) (Yes)
Clean out all memories	(CLR) (Memory) (Yes)
Restore the default settings , then clear all memories	(CLR) (All) (Yes)
Refuse to calculate a number, or quit menus
Find an answer
You can get a decimal result in Math mode
Switch between decimal and exact solutions in Math mode
Toggle between displaying fractions as mixed numbers or fractions that are incorrect in Math mode
Utilize the results of your previous calculations...
... e.g. to find 42 minus the previous result
Store a value in the memory 'M'	(STO) (M)
Clear a value that is stored in M memory	(STO) (M)
Include a value in the memory 'M'
Subtract the value of in memory 'M'	(M-)
Display the value that is stored in the 'M' memory	(M)
Utilize the value of the memory of 'M' to perform the course of calculating...
... e.g. to find 42 minus the memory "M"	(M)
The angles that are for measurement in degree	(SETUP) (Deg)
Be sure to measure angles measured in radians	(SETUP) (Rad)
Set the answers to be displayed in 3 decimal places (To utilize a different number of decimal points, replace with the number)	(SETUP) (Fix)
Set answers to be displayed 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, X, Y memories are used in the same manner as memories in the M memory with the exception that these have no 'add to' and 'subtract from' functions.