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Mastering the Calculator using the Casio fx-82AU PLUS 1 Introduction This is one in a series of booklets prepared to assist students who are learning to use a

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CASIO -82AU PLUS

UNIVERSITY OF SOUTHERN QUEENSLAND

The Learning Centre

| Learning and Teaching Support Unit

Mastering the calculator

using the Casio fx-82AU PLUS

Learning and Teaching Support Unit (LTSU)

The Learning Centre

Guide book

Published by

University of Southern Queensland

Toowoomba Queensland 4350

Australia

http://www.usq.edu.au ?University of Southern Queensland, 2010.2.

Copyrighted materials reproduced herein are used under the provisions of the Copyright Act 1968 as amended, or

as a result of application to the copyright owner.

No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any

means electronic, mechanical, photocopying, recording or otherwise without prior permission. Produced by the Distance and e-Learning Centre using FrameMaker7.1 on a Pentium workstation.

TABLE OF

CONTENTS

PAGE

Introduction 1

A word about starting out 2

1. Addition and subtraction 3

2. Multiplication and division 7

3. Brackets 9

4. Powers 11

5. Fractions 17

6. Using the x

-1 key 19

7. Scientific notation 20

8. Factorial x!22

9. Using memory 23

10. Statistics 25

11. Linear regression 32

12. Trigonometric functions 35

13. Exponential and logarithmic functions 38

14. Degrees, minutes, seconds 40

Review calculator exercises 42

Calculator solutions 43

Mastering the Calculator using the Casio fx-82AU PLUS1

Introduction

This is one in a series of booklets prepared to assist students who are learning to use a calculator. They have been prepared by staff in The Learning Centre from the Learning and Teaching Support Unit (LTSU) at USQ. The series comprises:

Mastering the Calculator

•Using the Casio fx-100s (also suitable for Casio fx-570) The instructions in this booklet only explain some of the keys available on your calculator necessary for basic work in data manipulation. If you require more assistance please contact The Learning Centre. If you would like information about other support services available from The Learning Centre, please contact

The Learning Centre (TLC)

Learning and Teaching Support Unit (LTSU), R-Block

The University of Southern Queensland

Telephone: 07 4631 2751

Email: tlc@usq.edu.au

Fax: 07 4631 1801

Home page: http://www.usq.edu.au/learningcentre

Note the booklets are also available online at the above address (follow the prompts).

2Mastering the Calculator using the Casio fx-82AU PLUS

A word about starting out

(so you are in Normal mode.) press so you are in Degree mode (a "D" will appear on the screen). There is also a mode which gives you a preference for displaying the decimal point as a dot or comma as 34.26 or 34, 26.

Press (for display).

Press for dot or

Press for comma.

Press and "math" should appear on the screen.

Mastering the Calculator using the Casio fx-82AU PLUS3

1. Addition and subtraction

1.1 To add numbers

Find the key

(it is shown on the photograph of the calculator here).

Example

To add 7 and 3, type

The display should read 10

To add 7 and 3.1, type

The display will read . Press to get 10.1.

addition key

DEL key

key 101

10---------

4Mastering the Calculator using the Casio fx-82AU PLUS

Example

I want to find the total amount I earned in the past four weeks. If I earned $471, $575, $471 and $528, the key strokes would be

The display should read 2045.

1.2 Sometimes you make an error when typing in a number

If this happens use the key to cancel the number and then type in the correct number and continue.

Example

If you want to enter 3 + 4 but accidentally type

press to cancel the 5.

Now type

Example

If I want to add 471 and 575 but I typed

I can cancel 6 by typing and then typing

The display should read 1 046.

'Try practising cancelling with the key until you are comfortable with its use.'

1.3 The keys are used when you to delete other data

Example

If you typed:

471 + 546

but you wanted 471 + 576 press the key. Press to delete the 4 then, press .

The 7 now replaces the 4.

Mastering the Calculator using the Casio fx-82AU PLUS5

Press .

The display should read 1 047.

Practice using this key when replacing digits, operation keys (+ - × ÷), or more than one digit

(use the DEL key).

You can also use insert anything you omitted.

1.4 To subtract numbers

Find the key (it is shown on the photograph of the calculator following).

Note: the

key is only used for entering negative numbers.

Example

To subtract 35 from 257, type

The display should read 222

negative key subtraction key

6Mastering the Calculator using the Casio fx-82AU PLUS

Example

348 - 24 - 19

The keystrokes are

The display should read 305.

Sometimes you may have a sum like this:

-7 + 4

You can use the key.

The key strokes are

The display should read -3.

You could also use the keystrokes

In this case the calculator recognises the - as a negative (not recommended to do it this way). Note: Avoid using the key to enter negative numbers Mastering the Calculator using the Casio fx-82AU PLUS7

2. Multiplication and division

2.1 To multiply numbers

Find the key (it is shown on the photograph of your calculator here).

Example

To multiply 7 and 3, type

The display should read 21

To find 753 × 492, type

The display should read 370 476

key for divisionkey for multiplication key

8Mastering the Calculator using the Casio fx-82AU PLUS

2.2 To divide numbers

Find the key (it is shown here on the photograph of the calculator)

Example

To divide 35 by 7, type

The display should read 5

To divide 7 905 by 85, type

The display should read 93

To divide 56 by 23947 type

The display should read

To display in decimal form either press after pressing or press

If it reads 2.3385×10

-03 or something similar, then your calculator is in SCI (Scientific mode).

See page 2 to change to NORM (normal mode).

2.3 Combining multiplication and division

Example

If the question is

then it is really 27 ÷ 7 ÷ 4.

Try it.

The display should read 0.964285714

8

3421------------

27

74×------------

Mastering the Calculator using the Casio fx-82AU PLUS9

3. Brackets

Find the set of bracket keys on your calculator.

The fx-82AU PLUS allows you to use many sets of brackets.

Example

Do the calculation 471 - (93 + 11 + 2) on the calculator. (Make sure your calculation is in ordinary comp. mode - ( )

The keystrokes required are

The display should read 365.

Sometimes in calculations you will see other grouping symbols, for example, { } (called braces), [ ] (called square brackets).

LH bracket keyRH bracket key

10Mastering the Calculator using the Casio fx-82AU PLUS

Try these examples:

Exercise 1

(a) 25 + (7 + 2 - 4) (b) 18 (3 + 7) [a multiplication sign is understood 18 × (3 + 7)] but you don't need to press the

× key

(c) 4 + 5 [2 (3 + 7)] [to use two sets of brackets just press the same button] (d)

Answers: 30; 180; 104; 1

5

32+()-----------------

Mastering the Calculator using the Casio fx-82AU PLUS11

4. Powers

4.1 Squaring and higher powers

6 2 means 6 × 6. You can use the square key to do this calculation. (It is shown on the photograph of your calculator here.) Press the display should read 36.

Or you can use the power key on your calculator.

Find the key on your calculator (similar to the key on your computer keyboard).

Example

To square 6,

that is, find 6 2 , type

The display should read 36

power key square key square root key

12Mastering the Calculator using the Casio fx-82AU PLUS

To find 27

3 the required key strokes are and the display should read 19683. If you have learnt your multiplication tables you will already know the squares of the whole numbers from 1 to 12 and thus be able to complete much of the following table.

Exercise 2

Use your calculator to find the squares of the whole numbers from 13 to 25 and any other squares you are unsure of.

Exercise 3

You can use this key for other powers as well. Try these examples (a) 7 4 (b) 8 10 (c) (0.4) 6 (you do not have to type the brackets in) (d) (-7) 6 (you need to type the brackets in) (e) 5 0.4 (f) 5 -4 2 = 1 11 2 =21 2 2 2 = 4 12 2 =22 2 3 2 = 9 13 2 =23 2 = 529 4 2 =14 2 =24 2 = 576 5 2 =15 2 =25 2 = 625 6 2 =16 2 7 2 =17 2 8 2 =18 2 9 2 =19 2 10 2 20 2 Mastering the Calculator using the Casio fx-82AU PLUS13

Answers:

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