# Getting Started with your TI-83

a) ** Converting decimals to fractions .** Button you
will need: ** MATH **.

Example. To convert 0.5 to fraction, you need the following keystrokes:

0.5** ENTER, MATH , ENTER** (this will chose fraction option), **EN-
TER.
**

b)

**Roots .**Button you will need: math.

Example. To evaluate you need the following keystrokes: 5,

**MATH**

(chose option 5),

**ENTER**, 32,

**ENTER**.

Alternatively (faster) you can evaluate as . Type: 32 ^ (1=5).

c)

**Absolute value**. Button you will need:

**MATH**.

Example. To evaluate , you need the following keystrokes:

**MATH**, →,

**ENTER**, 2 ^ 3 - 3 ^ 2, ).

d)

**Graphing**. Enter the expression you need to graph. Use keystrokes:

Y =, X, T, θ, n (this is the button for x) and

**GRAPH**.

Change the graphing screen using

**WINDOW**.

Example. Graph y = x + 2. Type: Y =, then X, T, θ, n, button. Then

+2 and, finally,

**GRAPH**.

Now, let us graph y = x + 100. You will have to change the graphing

screen. Go to

**WINDOW**and change X

_{min }and Y

_{min}to -200 and X

_{max}

and Y

_{max}to 200.

**ZOOM**button and option 6 (ZStandard) will change your window to

standard viewing window (-10 ≤ x ≤ 10 and -10 ≤ y ≤ 10).

e)

**Evaluating**. We can evaluate an expression that depends on x for a

particular value of x on two ways .

1. By using

**CALC**. First enter your function (

**Y**= button). Press

**2nd CALC**and choose

**1:value**. Then enter the value of x for

which you want to evaluate the function.

**NOTE:**You might need to adjust the windows.

Example. Evaluate for x = -1, 1 and 2.

2. By using Y variable . Example. Let us evaluate
for x =

-1, 1 and 2 again. First we enter as Y_{1} in Y = window.

Then type: **VARS**, → (chose **Y-vars**), **ENTER** (chose function),

ENTER (you will get Y_{1}). Then type (-1). Similarly, we will get

Y_{1}(1) and Y_{1}(2).

This method allows you to evaluate a couple of different expressions

at the same time.

f) **Scientific Notation**. Change your calculator to scientific notation

(**MODE, Sci**).

Example. Evaluate
.
**NOTE: **The calculator answer 7.9149e4

means 7.9149 ·10^{4}.

**Problems:**

1. Convert -.485 to a fraction .

2. Evaluate and

3. Evaluate

4. Graph the function :

5. Evaluate the function at values x = 1, x
= 3 and x = 20.

6. Graph the function

7. Evaluate the functionat values x = -1, x = 0 and

x = 16.

8. Scientific notation problems are on a separate handout.

Prev | Next |