Casio fx-82AU PLUS User manual

© Sue Thomson and Shriro
This page may be photocopied for non-commercial use. Page 1
Using the Casio
Fx-82AU PLUS II and fx-100AU PLUS
scientific calculators
The pages in this guide may be photocopied
for classroom and non-commercial purposes.

© Sue Thomson and Shriro
This page may be photocopied for non-commercial use. Page 2
Operating instructions
Casio fx-82AU PLUS II and Casio fx-100AU PLUS
In addition to the best features of previous models the calculators have several new and improved
features.
Contents
Topic
Page
Getting started
3
Set up –degrees to radians
4
Decimal places and scientific notation
4
Fractions and decimals
5 - 6
Indices
6
Greatest common divisors, Lowest common multiples
7
Prime factorisation
8
Trigonometry
8 - 9
Converting between degrees and radians
10
The statistics menu
11 –13
Using the memories
14
Clearing the memories
14
Verify mode
15
Converting between polar and rectangular coordinates
16
Combinations and permutations
16
Using the last entry
17
Multi-statements
17
The percentage key
18
Random number simulations
18
Features unique to the fx100AU PLUS
Vectors
19
Calculations in different bases
20
Metric conversions
21
Complex numbers
22
Tips and hints
23
Trouble shooting
24

© Sue Thomson and Shriro
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Getting started
After you have turned on the calculator the first step is to choose the type of calculation you wish to do.
Press wto bring up the possibilities. While the fx-100AU PLUS has more possibilities both calculators
work in the same way.
fx-82AU PLUS II fx-100AU PLUS
COMP is the computation mode. This is the mode for performing the majority of scientific calculations.
CMPLEX is the complex number mode.
STAT is the mode for statistics and regression.
BASE-N allows calculations and conversions in bases 10, 6, 2 and 8.
VERIF is a new mode which enables the user to check whether a calculation or process is true or false.
VECTOR is another new menu that makes two and three dimensional vector calculations possible.
To enter a mode press the key for the digit indicated. For example, on both calculators press 1for the
computation mode, while statistics is accessed by pressing 2on the fx-82AU PLUS II and 3on the fx-
100AU PLUS.
The Computation mode
The computation mode offers a choice of how you would like to display mathematical expressions.
MthIO setup LineIO setup
Press qw to bring up the setup menu. Then select 1for mthIO or 2for lineIO.

© Sue Thomson and Shriro
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Setup information
Setting the calculator to degrees or radians
In the computation mode press qw to bring up the following screen:
Press 3for degrees or 4for radians. The calculator will remember the setting until you change it.
Decimal places and scientific notation
In the computation mode press qw for the above screen. Press 6to fix the number of decimal
places. The calculator will ask for the required number of decimal places. Press the number you require
and the calculator will continue to display answers in this form until you instruct it to do otherwise.
Refer to information on page 4 about toggling between fractions and decimals to obtain answers in
different forms.
Answers expressed in scientific notation
In the computation mode press qw for the setup screen. The calculator will then ask for the
number of significant figures required. Press the number you require and the calculator will continue to
display answers in this form until you instruct it to do otherwise.
Setting the calculator back to ‘normal’
In the computation mode press qw for the setup menu. Press 8for ‘normal display’. The
calculator will ask you whether you want Norm 1 or Norm 2. The difference between Norm 1 and Norm
2 is the value when the calculator swaps from a display as a decimal or a display as a decimal in scientific
notation.
In Norm 1, the answer to 1P200 is displayed as 5 × 10-3.
In Norm 2, the answer to 1P200 is displayed as 0.005.
Norm 2 doesn’t use scientific notation until the display is of the order of 5 × 10-9.

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Fractions and decimals
The key strokes for fractions are slightly different in the MthIO than in the LineIO mode.
Fractions in the LineIO mode
Use the abutton to enter any expression involving a fraction. You need to press a after the whole
number and after the numerator.
To enter 1⅔ + 5⅞ press 1a2a3+5a7a8=.
Fractions in MthIO mode
To enter a traditional fraction, for example ⅝, press a5 then use the arrow down section of the
blue, round replay button (R) to move to the position for the denominator. The press 8.
To enter a mixed numeral, for example 3⅘, press qa then 3$4R5$.
To enter 1⅞ + 5⅔ press qa1$7R8$+qa5$2R3$=.
Answers in different forms
The calculator can display the answer as an improper fraction or decimal and pressing n will toggle
between the two. Pressing qn (for N) will toggle the display between a mixed numeral and an
improper fraction.
Simplifying fractions
In MthIO and in LineIO mode the calculator can simplify fractions. Enter the fraction followed by =.
or

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Reciprocals
The u button will display a fraction’s reciprocal. To display the reciprocal of 1⅔ enter the fraction and
press = followed by u=.
Then
Fractional indices
The fraction button can be used as an index.
or
In the MthIO mode the button sequence is 32^a3R5$=.
In the LineIO mode the sequence is 32^3a5)=. Note that the calculator supplies the
first bracket and the second bracket can be omitted if it is the last entry before the = button.
Negative fractional indices
The calculator can execute an impressive range of calculations with negative and positive fractional
indices. Some examples include:
Naturally each of the above examples can be completed in the LineIO mode.

© Sue Thomson and Shriro
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Square and other roots
The calculator has inbuilt buttons for square and cube root as well as a button for any root.
Examples
The button sequence s5= determines the value of √5.
The button sequence to calculate the 5th root of 20 is qF5$20=.
Greatest common devisor and Lowest common multiple
Mode: 1 Computation or 2 statistics
Method: Access GCD or LCM then enter the pair of numbers separated by a comma.
Example
The greatest common devisor is also called the highest common factor. To calculate the greatest
common devisor of 45 and 80 press QO45 q )80)=.
To calculate the lowest common multiple of 12 and 9 press QP12 q)9)=.

© Sue Thomson and Shriro
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Prime factorization
Mode: 1 Computation
Method: Two steps are required. Enter the number to be factorized and press equals. Then activate
factor.
Example
To express 6480 as a product of its prime factors press 6480= q x.
Trigonometry
Mode: 1 Computation
Always check the setting for angles before you start any calculations involving trigonometry. There will
be a small letter at the top of the screen. A small D indicates that the calculator is set to degrees, a small
R indicates radians and a small G, gradients.
Set to degrees Set to radians
The method for changing from degrees to radians is on page 3.
Entering trigonometric expressions
The button sequence to enter 4.5sin71owith the calculator set in degrees is 4.5j71=
A Ois not required between the 5and j. Neither is the closing bracket required at the end.

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Degrees, minutes and seconds
Thexbutton is used to enter degrees, minutes and seconds. To enter 52o36’ 12” press
52x36x12x
Expressing a decimal in degrees, minutes and seconds
This process is slightly different to the process on previous calculators. Press
57.33908728x= to express 57.33908728 in degrees, minutes and
seconds.
Using an inverse trigonometric function
The button sequence ql1.56= is required to solve the equation tanφ = 1.56.
If you press xat the end of ql1.56= the calculator will display the answer in
degrees, minutes and seconds. This process is slightly different to the process on previous calculators.

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Converting between degrees and radians
When you are converting angle types you MUST have the calculator set to the type of angle you are
converting INTO.
Example
Change 1.2 radians into degrees.
Set the calculator to degrees then press 1.2qM2= .
Example
Convert 50oto radians.
Set the calculator to radians then press 50qM1=.