Casio fx-82AU PLUS Installation and operating instructions

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Using the Casio fx-82AU PLUS
Scientific Calculator
Techniques and activities
© Sue Thomson and Shriro Australia PTY Limited Casio Education division
The pages and activities included in this publication may be copied for classroom
use.

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Publishing information
Published by Sue Thomson
Copyright © Sue Thomson and Shriro Australia PTY Limited, Casio Education Division 2008
First published in 2008
Reproduction and communication for educational purposes
All rights reserved. No part of this publication may be stored in a retrieval system or
transmitted in any form or by any means, electronic, mechanical, photocopying, recording or
otherwise, except under the conditions described in the Copyright Act 1968 of Australia
and subsequent amendments, without the prior written permission of the copyright owners.
The copyright owners intend these instructions and worksheets to be reproduced in
numbers sufficient for use by individual students in the classroom. Permission is therefore
granted for teachers to reproduce the pages in quantities for non-commercial classroom use.
National Library of Australia Cataloguing-in-Publication data:
ISBN 978-0-646-49292-6
Thomson, Sue,
Using the Casio fx -82AU PLUS Scientific Calculator
For secondary school students and teachers

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Contents
Page
Getting started ……………………………………………………………………. 4
MathIO display ……………………………………………………………………. 4
LineIO display ………………………………………………………………………. 4
Setting degrees or radians ………………………………………………… 5
Fixing decimal places ……………………………………………………………. 5
Scientific notation ……………………………………………………………… 5
Normal display ……………………………………………………………………… 5
Fractions and decimals ……………………………………………………… 6, 7
Fractional indices ………………………………………………………………… 7
Negative, fractional indices ……………………………………………… 8
Powers and roots ……………………………………………………………………9
Trigonometry ………………………………………………………………………10, 11
Changing degrees Û radians ……………………………………………… 11
Statistics …………………………………………………………………………… 12 – 15
Using the random number function …………………………………. 15
Using the memories ……………………………………………………………. 16
Tips and hints ………………………………………………………………………. 17
Trouble shooting …………………………………………………………………18, 19
Developing calculator skills practice sheets
Fractions and decimals……………………………………………… 20
Percentages ……………………………………………………………….. 21
Working with fractions …………………………………………… 22
Fix, scientific notation and norm …………………………… 23
Roots and exponents ………………………………………………… 24
Trigonometry ……………………………………………………………… 25
Statistics ……………………………………………………………………… 26
Using the memories ………………………………………………….. 27
Degree Û Radians ……………………………………………………… 28
Logs, natural logs and e ……………………………………………… 29
Activities and worksheets for students
Gallipoli Australia and New Zealand join WWI 30, 31
Waiting time investigation ……………………………………. 32
Playing dice simulation …………………………………………….. 33
Subtracting dice bingo …………………………………………… 34
Should you require further information refer to the booklet of instructions
that was supplied with the calculator. Watch the Casio website
www.casioed.net.au or contact [e-mail] for more classroom
activities with the fx -82AU PLUS.

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Getting started
After you have turned the calculator on the first step is to choose whether you
want to do a calculation or to work in statistics. Press the MODE key to enter your
choice of calculations (i.e. computation) or statistics.
Press 1 for calculation or 2 for statistics.
The Comp (calculations) menus
The calculations menu offers you the choice of how you would like the maths
displayed. The choices are MthIO, the way we write maths or Line IO the way
calculators have traditionally displayed maths. The following screens show an
example of the two options.
MthIO mode LineIO mode
Selecting Math (MthIO) or LineIO
When you are in the comp mode press SHIFT MODE (SET UP) and the following
screen will be displayed. Enter the Math mode by pressing 1 and Line mode by
pressing 2.

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Set up information
Setting the calculator to degrees or radians
When you are in the comp mode press SHIFT MODE (SET UP) and the following
screen will be displayed.
Press 3 for degrees or 4 for radians.
Setting decimal places and scientific notation
To fix the number of decimal places
When you are in the comp mode press SHIFT MODE (SET UP) and the above
screen will be displayed. Press 6.
The screen then asks for the number of decimal places required. Press the number
you want and the calculator will continue to display all numbers in this form until you
instruct it to do otherwise. Refer to information on page 6 about toggling between
fractions and decimals for answers in different forms.
Answers expressed in scientific notation
When you are in the comp mode press SHIFT MODE (SET UP) and the above
screen will be displayed. Press 7.
The screen then asks for the number of significant figures required. Press the
number you want and the calculator will continue to display all numbers in this form
until you instruct it to do otherwise.
Setting the calculator back to ‘normal‛
When you are in the comp mode press SHIFT MODE (SET UP) and the above
screen will be displayed. Press 8.
The screen then asks whether you would like 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 to 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 Math mode than in the
Line mode.
Fractions in the Line mode
Use the a button to enter any expression involving fractions in the same way as
the z button was used in the past.
To enter 1½ + 3¾ press 1a1a2+3a3a4p.
Answers in different forms
The calculator can display the answer as an improper fraction, mixed numeral or
decimal and it can toggle between all three.
To change 5E1E4 to a decimal press n.
To change either 5.25 or 5E1E4 into an improper fraction press SHIFT nN.
Fractions in the Math mode
To enter a traditional fraction, for example ½, press a1 then use the bottom
of the replay button to position the cursor on the denominator and press 2.
To enter a mixed numeral, for example 5¾ press SHIFT a then
5$3R4p.
To enter 1½ + 3¾ press
SHIFT a1$1R2$+ SHIFT a 3$3R4p.
The picture of the screen for this calculation is on the following page.

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Remember you can toggle between the answer displayed as an improper fraction,
mixed numeral and decimal. Refer to the section ‘answers in different forms‛ on the
previous page.
Simplifying fractions
In either mode the calculator will express a fraction in its simplest form. Enter the
fraction followed by p.
OR
Reciprocals
The u button will find the reciprocal of a fraction. To find the reciprocal of 1½
enter the fraction and press p, then up.
OR
Fractional indices
The fraction button can be used as an index.
OR
In the Math mode the button pressing is 32fa3R5p.
In the line mode the button pressing is 32f3a5p. Note! The first
bracket is supplied by the calculator and the second bracket can be omitted if it is
the last entry before p.

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Negative, fractional indices
The calculator can execute an impressive range of calculations with negative and
positive fractional indices.
or
Occasionally the whole screen can‛t be displayed in the math mode, but the
calculation remains possible. Naturally the following calculations can be executed in
the line mode.
Þ
Þ
Powers, math mode and brackets
Provided the cursor is placed appropriately brackets can be omitted. Observe the
above calculations in the math mode entered without brackets.
Þ

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Powers and roots
Determining powers
Both screens show the value of 1.5
3
. The button pressing is the same in both modes.
1.5f3p.
OR
Determining roots
The F button is used to determine roots. The screens show the value of the 5
th
root of 1024. The button pressing in each mode is shown below the screens.
OR
In the maths mode: SHIFT f5$1024p.
In the line mode: SHIFT f1024!!!!!5.
Using the M feature
The M button allows a calculation to proceed using the previous answer. In both
modes the button pressing used to produce the following screens was:
sMp.

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Trigonometry
Before starting any calculations involving trigonometry always check the angle
measure for degrees, radians or gradients. If the angle measure isn‛t consistent
with the type of angle being used, all answers will be wrong. A D at the top of the
screen indicates that the calculator is set to degrees. An R indicates radians and G
gradients. Gradients are NEVER used in trigonometry in Australian schools.
Set in degrees Set in radians
Instructions to change the calculator from degrees to radians or radians to
degrees are on page 5.
Entering trigonometric expressions
Enter the trigonometric ratio followed by the angle. The calculator will insert a left
hand bracket but entering a ‘close brackets‛ is not required.
Degrees, minutes and seconds
The x button is used for entering degrees, minutes and seconds. The button
sequence for entering 52
o 36‛ 14” is 52x36x14xp.
Using inverse trig
The following button sequence is required to solve the equation tanq = 1.56.
SHIFT l1.56. If the 1.56 is the result of the previous calculation the
sequence SHIFT lM can be used.