Texas Instruments TI-83-Plus - Page 36

Chapter 1: Number Sense Section 2: Rational Numbers
Topics in Algebra 1 © 2001 Texas Instruments Teacher Notes 1-22
³
Try-It!
é
on Your TI
.
83 Plus or TI
.
73
Review the Order of Operations rules with students, if necessary. Explain to them that the
calculator uses the Order of Operations rules to simplify expressions. Discuss with them how
parentheses are used.
Note
: The
³
Try-It!
activities are repeated for each of the two calculators—the TI
-
83 Plus and then the TI
-
73. The problems are the
same, but they vary due to the differences in the two calculators. The
Additional problems
, which are identical, can be performed on
either calculator. They are repeated for your convenience when you copy the activities.
Tell students to do the two calculator
³
Try-It!
investigations.
•
Investigate how the calculator computes addition expressions. Solve
6
5
3
2
+
.
•
Investigate how the calculator computes division expressions. Solve
3
2
2
1
÷
.
Ask students to explain the difference in the two results in second investigation.
Although each of the two results is correct based on how the problem was entered, to make sure
that the division is performed correctly, the problem must be entered as (1
à
2)
à
(2
à
3). The
answer is 3/4, not 1/12. The calculator uses the Order of Operations rules. Operations inside
parentheses are performed before operations outside parentheses.
On the TI
-
73, students must simplify the fraction 75/100 to get 3/4. They may either specify the
factor to use, as shown, or let the calculator simplify the fraction, one factor at a time by
repeatedly pressing
B
.
Additional problems—Make sure that students understand and use the Order of Operation
rules so they can determine when to use parentheses.
1.
M
1
3
+
1
4
=
M
1
12
2.
M
2
3
Q
5
6
=
M
5
9
3.
3
5
P
5
6
=
18
25
4.
1
2
N
M
2
5
=
9
10
5.
M
2
5
+
1
4
Q
2
3
=
M
7
30
6.
1
8
Q
3
16
P
1
2
=
3
64
7.
M
1
6
N
1
12
+
3
4
=
1
2
8.
M
1
2
N
3
4
P
(
M
3) =
M
1
4