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© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide for Teachers
2
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 3 decimal places.
Math Concepts
• rounding
• place value
• division
• comparing and
ordering decimals
Materials
• TI-30X
Ù
S
• 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
Ö
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 page 3 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
The Better Batter — The FIX Key
Содержание -30XIIS - Handheld Scienfic Calculator
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