Texas Instruments TI-Nspire CX Manual de usuario

Page 1

N Hopley. Sep 2015. TI-Nspire OS4.0

Science, Technology, Engineering & Maths (STEM)

Calculator Guide

Texas Instruments TI-Nspire CX Handheld

(Operating System 4.0)

This short guide is designed to instruct you on how to set up your handheld to perform

calculations that you will typically do in Science, Technology, Engineering and Maths.

This guide will not attempt to explain the underlying Numerical or Mathematical concepts.

Page

1 Layout of the keypad, highlighting keys used in this guide

2 The Document Settings Menu

3 Restoring the General Settings to Factory Default Settings

4 Using the TI-Nspire for Calculations with Factory Default Settings

5 Using the TI-Nspire in Normal Calculation Mode

6 Using the TI-Nspire in Fixed Decimal Place Mode

7 & 8 Using the TI-Nspire in Scientific Notation Mode

9 Using the TI-Nspire in Engineering mode

10 Using the TI-Nspire in Degree Mode for Calculations

10 Using the TI-Nspire in Degree Mode for Drawing Graphs

11 Calculating Reciprocals

12 Converting numbers between Decimal and Binary

13 & 14 Preparing the TI-Nspire for Assessments

15 Removing the TI-Nspire from Press-to-Test mode

Page 1 - Layout of the keypad, highlighting keys used in this guide.

Touchpad/

Cursor Control

Scratchpad

Tab

Control

(press to

access blue items)

“to the Power of”

Exponent

Home

Delete

Catalogue

Fraction Template

(press /p)

Force Decimal

Approximation

(press /·)

Enter

Negative

Page 2

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 2 - The Document Settings Menu

The Document Settings Menu controls how the TI-Nspire displays answers to calculations.

Go to the Home screen by pressing c.

Press 5to select Settings

This will open a new pop-up menu, as shown !

Press 2to select Document Settings

You will now see the Document Settings menu.

You can either press e, or you can use the

Touchpad, to move to different options.

You can press !to open up a drop-down menu, and

then use "and #to move through the settings.

You can either press ·,or you can click on the

centre of the touchpad x, to make your setting choice.

This guide will demonstrate how several of these menu settings can be used to

control how answers to calculations are displayed.

You can also access the Document Settings menu from within any Document or

Scratchpad, without having to go back to the Home screen.

Simply use the touchpad to move the cursor arrow over the cog/battery icon in the top

right corner.

Then click on the centre of the touchpad to select the icon, which will then open up the first

pop-up menu.

Page 3

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 3 - Restoring the Document Settings to Factory Default Settings

It is often helpful to reset the general settings to avoid unexpected behaviour when starting

a new calculation task.

This resetting action is called ‘Restoring settings to factory default settings’.

Go to the Home screen by pressing c

Press 5to select Settings

Press 2to select Document Settings

Select

Select to restore the settings.

Select

Select to apply the restored settings.

Page 4

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 4 - Using the TI-Nspire for Calculations with Factory Default Settings

Restore Factory Default Settings by first going to the

Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

Select and then to Restore factory default

settings.

Notice that Calculation Mode is set to Auto

This means that the TI-Nspire will try and give answers exactly, without writing them as

decimals.

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 2p3and then press ·, the

display should look like that shown !

Notice that the answer is displayed as an exact

fraction.

Press /then ·.

This selects ≈and displays the last calculation’s

answer as a decimal approximation.

You can force the TI-Nspire to give a decimal answer

straight away by simply including a decimal point

somewhere in your calculation - even at the end of a

number will do.

For example, you could

EITHER type in 2^p3 which will display

OR type in 2p3^ which will display

€

Page 5

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 5 - Using the TI-Nspire in Normal Calculation Mode

We are taking ‘Normal Calculation Mode’ to mean here that the TI-Nspire will give answers

to all calculations as decimal approximations, rather than exact values.

Go to the Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

Select and then to Restore factory default

settings.

For Display Digits select Float

For Calculation Mode select Approximate

Select and then .

These settings will display all answers as decimals, with up to 12 decimal places on show.

Access the Scratchpad Calculator by pressing ».

When you type 2p3and then press ·, the

display should look like that shown !

Notice that the displayed answer has been rounded to

12 decimal places.

The TI-Nspire actually knows the answer to 14 digit

accuracy, and it uses these extra known digits to

round the answer correctly.

Page 6

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 6 - Using the TI-Nspire in Fixed Decimal Place Mode

In this example, we will select 3 decimal places.

Go to the Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

Select and then to Restore factory default

settings.

For Display Digits select Fix 3 (scroll down the list to below all the Float settings)

For Calculation Mode select Approximate

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 1^2345and then press ·,

the display should look like that shown !

Notice that the number has been rounded to 3 decimal

places.

Page 7

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 7 & 8 - Using the TI-Nspire in Scientific Notation Mode

Go to the Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

Select and then to Restore factory default

settings.

For Display Digits select Float

For Exponential Format select Scientific

For Calculation Mode select Approximate

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 12345 and then press ·, the

display should look like that shown !

Notice that the number has not been rounded, as the

Float setting was chosen.

If you wanted Scientific Notation to 3 decimal places,

press c5 2

For Display Digits select Fix 3

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 12345 and then press ·, the

display should look like that shown !

Notice that the displayed result has been rounded to 3

decimal places.

Page 8

N Hopley. Sep 2015. TI-Nspire OS4.0

If you wanted Scientific Notation to 3 significant figures

places, press c5 2

For Display Digits select Float 3

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 12345 and then press ·, the

display should look like that shown !

Notice that the displayed result has been rounded to 3

significant figures.

If you wanted to do the calculation

You would type:

1^23i4 p5^67iv8

and then press ·.

Note that pressing i4 means the same as

…pressing ·becomes….

Alternatively, you could enter the calculation using the

fraction template. Type:

/p 1^23i4 e 5^67iv8

to give a screen like that shown

and then press ·.

The above results are displayed with 3 significant

figures (Float 3) in Scientific mode.

The same result in just Float mode would look like !

€

(1.23 ×104)÷(5.67 ×10−8)

€

×10

Page 9

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 9 - Using the TI-Nspire in Engineering mode

Go to the Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

Select and then to Restore factory default

settings.

For Display Digits select Float

For Exponential Format select Engineering

For Calculation Mode select Approximate

Select and then .

Access the Scratchpad Calculator by pressing ».

When you type 12345 and then press ·, the

display should look like that shown !

Notice that the number has not been rounded, as the

Float setting was chosen.

Page 10

N Hopley. Sep 2015. TI-Nspire OS4.0

Page 10 - Using the TI-Nspire in Degree Mode for Calculations

Go to the Home screen by pressing c.

Press 5to select Settings

Press 2to select Document Settings

You are now viewing Document Settings

For Angle select Degree

Select and then .

Page 10 - Using the TI-Nspire in Degree Mode for Drawing Graphs

Go to the Home screen by pressing c.

Press Bto select the Scratchpad Graph

Press bto select 8: Settings

--- OR ---

Press 1to select New Document

Press 2to Add Graphs

Press bto select 8: Settings

You are now viewing Graphs & Geometry Settings

For Graphing Angle select Degree

Select and then .

The important thing to note here is that you use the

bbutton to change the Graphing Angle settings, but

to change the Calculation Angle settings, you use the

cog/battery icon or the home screen to access the

Document Settings screen.

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