© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: A Guide for Teachers
2
The Better Batter — The FIX Key
Overview
Students use
%
‚
on the TI-30X
Ù
S to change
numbers to different place values. Students
calculate batting averages using the TI-30X
Ù
S and
then round their answers to three decimal places.
Math Concepts
• rounding
• place value
• division
• comparing and
ordering decimals
Materials
• TI-30X ÙS
• pencil
• student
activity
Introduction
1. Have students practice rounding the following
numbers to 3 decimal places using pencil and
paper.
a. 2.35647 2.356
b. 15.3633 15.363
c. 0.02698 0.027
2. Have students round the following numbers to 4
decimal places using the TI-30X
Ù
S.
a. 4.39865 4.3987
b. 72.965912 72.9659
c. 0.29516 0.2952
d. 0.00395 0.0040
Activity
Present the following problem to students:
You are going to play Virtual Baseball. You need to
select 9 players from the list to be on your team.
Choose the players with the best batting averages.
Find the batting averages (number of hits
¾
number
of times at bat) rounded to 3 decimal places for each
player. Make a list of your players in order, from
highest to lowest.
See the table on the next page for solutions.
³ 1. Enter the first number.
4.39865
2. Press % ‚ to display
the menu that lets you set
the number of decimal
places.
F0123456789
3. Press
4
to select 4
decimal places.
4.39865
4. Press <.
4.39865
4.3987
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