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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?