Texas Instruments TI15TK Teacher Guide - Page 27

Related Procedures, Overview

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Related Procedures Overview Students will use the two constant operations (› and œ) to compare the results of different mathematical procedures and determine how they are related. Grades 2 - 6 Math Concepts • whole numbers • addition, subtraction, multiplication, division • fractions (Grades 5-6) • decimals (Grades 5-6) Materials • TI-15 • pencil • student activity (page 23) Introduction 1. Have students program › with +2 and œ with -2. 2. Have students enter 8 on their calculators, press ›, and read the output (1 10, which means adding 2 once to 8 gives 10). 3. Have students press œ to apply the second constant operation to the output of the first constant operation, and then read the output (1 8, which means subtracting 2 once from 10 gives 8). 4. Have students continue this process with various numbers as their first input. Discuss their results. (Pressing › and then œ always gets you back to the first input number, which means › and œ are inverse procedures.) 5. Challenge students to find more pairs of procedures for › and œ that will follow the same pattern and record their investigations using the Related Procedures student activity page. ³ To use › and œ: 1. Press › (or œ). 2. Enter the operation and the number (for example, T 2). 3. Press › (or œ). 4. Enter the number to which you want to apply the constant operation. 5. Press › (or œ). The display will have a 1 on the left and the result on the right. If you press › (or œ) again, the calculator will apply the constant operation to the previous output and display a 2 at the left, indicating the constant operation has been applied twice to the original input. © 2000 TEXAS INSTRUMENTS INCORPORATED TI-15: A Guide for Teachers 20

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© 2000
T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-15: A Guide for Teachers
20
Related Procedures
Grades 2 - 6
Overview
Students will use the two constant operations (
›
and
œ
) to compare the results of different
mathematical procedures and determine how they
are related.
Math Concepts
• whole numbers
• addition,
subtraction,
multiplication,
division
• fractions
(Grades 5-6)
• decimals
(Grades 5-6)
Materials
• TI-15
• pencil
• student
activity
(page 23)
Introduction
1.
Have students program
›
with +2 and
œ
with -2.
2.
Have students enter
8
on their calculators, press
›
, and read the output (
1
10
, which means
adding 2 once to 8 gives 10).
3.
Have students press
œ
to apply the second
constant operation to the output of the first
constant operation, and then read the output
(
1
8
, which means subtracting 2 once from 10
gives 8).
4.
Have students continue this process with various
numbers as their first input. Discuss their results.
(Pressing
›
and then
œ
always gets you back
to the first input number, which means
›
and
œ
are inverse procedures.)
5.
Challenge students to find more pairs of
procedures for
›
and
œ
that will follow the
same pattern and record their investigations
using the
Related Procedures
student activity
page.
³
To use
›
and
œ
:
1. Press
›
(or
œ
).
2.
Enter the operation
and the number (for
example,
T
2).
3. Press
›
(or
œ
).
4.
Enter the number to
which you want to
apply the constant
operation.
5. Press
›
(or
œ
).
The display will have
a
1
on the left and the
result on the right. If
you press
›
(or
œ
)
again, the calculator
will apply the constant
operation to the
previous output and
display a
2
at the left,
indicating the
constant operation
has been applied
twice to the original
input.