Texas Instruments TI-73TP Teachers Guide - Page 7

to count or add up fractions to see if they equal

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2 Using the TI-73: A Guide for Teachers Number Sense 3. Give students a set time period to trade cookie "bites" (slices) with each other. Tell them they must trade equal-sized pieces, so they will need to know what fractional parts are equal to each other. Example A ½ slice may be traded for two ¼ slices. At the end of the trade time, each student should still have a whole cookie, but now it is made of a variety of cookie ingredients. 4. Discuss the results with your students. Ask: Why did some have a whole cookie, and some did not? What kinds of trades could they have made to end up with a whole cookie? 5. Use the TI-73 to verify equivalent fraction trades and to count or add up fractions to see if they equal a whole cookie. Example 1 If a student traded ¼ for 3/12, the student would enter Y = Q " - t # # # to = b # to Done b [ = Y Z b Example 2 If a student traded for ¼, ½, and 3/12, the student would enter Y = Q " \ Y = Z " \ [ = Y Z b Á If a 1 is displayed on the right-hand side of the screen, the 2 fractions are equivalent. If a 0 is displayed, they are not equivalent fractions. Á If a 1 is displayed on the right-hand side of the screen, the student knows the pieces add up to a whole cookie. © 1998 TEXAS INSTRUMENTS INCORPORATED

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2
Using the TI-73: A Guide for Teachers
Number Sense
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
3.
Give students a set time period to trade cookie “bites”
(slices) with each other. Tell them they must trade
equal-sized pieces, so they will need to know what
fractional parts are equal to each other.
Example
A ½ slice may be traded for two ¼ slices.
At the end of the trade time, each student should still
have a whole cookie, but now it is made of a variety of
cookie ingredients.
4.
Discuss the results with your students. Ask:
Why did some have a whole cookie, and some did
not?
What kinds of trades could they have made to end up
with a whole cookie?
5.
Use the TI-73 to verify equivalent fraction trades and
to count or add up fractions to see if they equal a
whole cookie.
Example 1
If a student traded ¼ for
3
/
12
, the student
would enter
Y
=
Q
"
-
t
#
#
#
to
=
b
#
to
Done
b
[
=
Y
Z
b
If a
1
is displayed on the
right-hand side of the
screen, the 2 fractions are
equivalent. If a
0
is
displayed, they are not
equivalent fractions.
Example 2
If a student traded for ¼, ½, and
3
/
12
,
the student would enter
Y
=
Q
"
\
Y
=
Z
"
\
[
=
Y
Z
b
If a
1
is displayed on the
right-hand side of the
screen, the student knows
the pieces add up to a
whole cookie.