Chapter 1: Number Sense Name
Section 3: Real Numbers Date
Topics in Algebra 1 © 2001 Texas Instruments Student Worksheet 1-27
³
Try-It!
é
on Your TI
.
83 Plus or TI
.
73
(continued)
Find the calculator decimal approximation for
À
2
.
To Do This Press Display
(TI
.
83 Plus shown)
1. Exit the Topics in Algebra 1
application and clear the Home
screen.
y
l
á
EXIT
â
:
2. Select the
Float
setting from the mode
screen.
Notes
: See
³
TIp
é
2:
Adjusting Your Calculator
Settings
for details.
The TI
-
83 Plus mode screen varies slightly from the
TI
-
73.
.
#
until
Float
is
highlighted
b
3. Return to the Home screen.
-
l
4. Calculate the decimal approximation
for
À
2.
-
z
2
E
b
5. Square your result.
Note
:
Ans
= previous answer. The calculator
remembers that you entered
‡
(2)
.
6
b
Is
À
2 equal to the decimal 1.414213562? It looks like the calculator says this is true. Calculate
1.414213562
2
to see.
6. Calculate the square of 1.414213562.
1
`
414213562
6
b
The answer shows 1.999999999, but you know you should get the answer 2.
Be careful! When you use your calculator, you have to know your math. The calculator can do
amazing math, but it only shows you an approximation for many answers. You have to
understand the problem before you use the calculator. It is up to you to determine if calculator
answers are reasonable and how you will use them.
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