Texas Instruments TI-15 Teachers Manual page 28

Related Procedures
Collecting and Organizing Data
As students use › and œ, have them record their
results in the appropriate tables on the Student
Activity page. For example, if a student is exploring
the relationship between
look something like this:
›
Table for
Input
1
2
3
œ
Table for
Input
2
4
6
Analyzing Data and Drawing Conclusions
Ask students:
What patterns do you see in your data?
Are the procedures inverses of each other? How
do you know?
If the output number for › is used as the input
number for œ and gives an output number
equal to the original input number for ›, then
the procedures may be inverses of each other, as
in and
x 2 ÷ 2
Does the pattern work with special numbers like
1 and 0? With fractions and decimals? With
positive and negative integers?
What happens if you use œ first, and then
›?
© 2000 T I
EXAS NSTRUMENTS
and , the tables might
x 2 ÷ 2
Procedure Output
x2 2
x2 4
x2 6
Procedure Output
P2 1
P2
2
P2
3
.
I
NCORPORATED
(Continued)
³
TI-15: A Guide for Teachers
To recognize the
equivalent procedures,
students may need to
use the Ÿ key to
change outputs from
decimal to fraction form
or vice versa.
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