Texas Instruments TI-73TP Teachers Guide - Page 8

Wrap-up, Extensions

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Number Sense 3 Activity 1: The Cookie Caper Wrap-up ♦ Have students make a list of the fractions they think are equivalent to each other. ♦ Have students enter their equivalent fractions into the TI-73 and change each to a decimal using > (fraction-to-decimal function). Discuss why these equivalent fractions also have the same decimal value. Example Press Y = Q > b. The display shows .25 as the decimal equivalent for ¼. Then enter [ = Y Z > b. The display again shows .25 as the decimal equivalent. ♦ Now have students make a diagram of their final cookies next to their original diagrams. Have them label the new fractional parts and decimal amounts. Extensions ♦ Older students: Change the decimals to percents and have a pie chart of all three amounts-fractions, decimals, and percents. ♦ All students: Cut their pieces in half, name the fractional parts, and trade again for another set time period. Investigate: Did they make equivalent trades? Was it easier this time, or more difficult? Does the new fractional cookie still add up to a whole cookie on the TI-73? © 1998 TEXAS INSTRUMENTS INCORPORATED

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Number Sense
Activity 1: The Cookie Caper
3
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Wrap-up
♦
Have students make a list of the fractions they think
are equivalent to each other.
♦
Have students enter their equivalent fractions into the
TI-73 and change each to a decimal using
>
(
fraction-to-decimal
function). Discuss why these
equivalent fractions also have the same decimal value.
Example
Press
Y
=
Q
>
b
.
The display shows
.25
as the decimal
equivalent for ¼.
Then enter
[
=
Y
Z
>
b
.
The display again shows
.25
as the
decimal equivalent.
♦
Now have students make a diagram of their final
cookies next to their original diagrams. Have them
label the new fractional parts and decimal amounts.
Extensions
♦
Older students:
Change the decimals to percents and
have a pie chart of all three amounts—fractions,
decimals, and percents.
♦
All students:
Cut their pieces in half, name the
fractional parts, and trade again for another set time
period. Investigate:
Did they make equivalent trades?
Was it easier this time, or more difficult?
Does the new fractional cookie still add up to a whole
cookie on the TI-73?