Year 7 Interactive Maths - Second Edition

Using a Graphics Calculator

The Keyboard

The keyboard has ten rows of colour-coded keys that are divided into 'zones'.

• Row 1 is used for graphing functions.
• Row 2 and Row 3 are used for entering and editing expressions.
• Row 4 has function keys, most of which access one or several menus of operations.
• The last six rows have keys for numbers, functions and operations.

Note:

• Almost every key has additional functions above it.
• The yellow functions to the left are 'second' functions that are accessed by pressing the yellow key.
• The green functions to the right are 'alphabetic' characters that are accessed by pressing the key, which is located just below the key.

Essential Steps

• To turn the calculator on, press .
• To turn the calculator off, press .
• If the screen is either too dark or too light, it will be hard to read.  To reset the contrast press followed by the up arrow to make the display darker or press followed by the down arrow to make the display lighter.  Choose the contrast that lets you see the characters clearly.
• Use the QUIT function by pressing the key followed by the key to return to the Home Screen, where all basic calculations are made.
• To clear the screen, press .

Make Sure you can:

• Switch the calculator on.
• Switch the calculator off.
• Adjust the screen contrast.

Multiplying Numbers

To multiply numbers using the TI-83 Graphing Calculator, enter the numbers in the same order in which they are written. Then press to obtain the answer.

Example 19 

Calculate 89 × 38.

Solution:

To calculate 89 × 38, switch the calculator on.  Press QUIT to see the Home Screen and press , if necessary, to clear it.

Then press 89 38 to obtain the answer as displayed on the calculator screen.
So, 89 × 38 = 3882.

Dividing Numbers

To divide numbers using the TI-83 Graphing Calculator, enter the numbers in the same order in which they are written. Then press to obtain the answer.

Example 20

Calculate 3686 ÷ 97.

To calculate 3686 ÷ 97, switch the calculator on.  Press QUIT to see the Home Screen and press , if necessary, to clear it.

Then press 3686 97 to obtain the answer as displayed on the calculator screen.
So, 3686 ÷ 97 = 38.

Order of Operations

To evaluate an expression containing more than one operation, we follow the BODMAS order of operations as we work through the expression from left to right:

The TI-83 graphing calculator evaluates an expression using the correct order of operations.  We write an expression on the Home Screen in the same order as it is given and then press .

Example 21 

Calculate 325 – 7 × 8.

Solution:

To calculate 325 – 7 × 8, switch the calculator on.  Press QUIT to see the Home Screen and press , if necessary, to clear it.

Then type 325 7 8 to obtain the answer as displayed on the calculator screen.
So, 325 – 7 × 8 = 269.

Example 22

Calculate 3 × 9 + 6 – (15 + 9) ÷ 8.

Solution:

To calculate 3 × 9 + 6 – (15 + 9) ÷ 8, switch the calculator on.  Press QUIT to see the Home Screen and press , if necessary, to clear it.

Then type 3 9 6 15 9 8 to obtain the answer as displayed on the calculator screen.
So, 3 × 9 + 6 – (15 + 9) ÷ 8 = 30.

Note:

The numbers and operations of an expression are entered from left to right as they are given.

Editing an Expression

To calculate 10 × 6, switch the calculator on.  Press QUIT to see the Home Screen and press , if necessary, to clear it.  Then press 10 6 to obtain the display shown.

So, 10 × 6 = 60.

Now suppose we need to calculate 10 × 8.  Press ENTRY (i.e. ) to recall the last entry.  Then use the arrow keys to move the cursor to 6 and type 8 over it.  Press to obtain the display shown.