© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI
-
34
Û
: A Guide for Teachers
29
My Favorite Recipe—Fractions
(Continued)
Activity
Present the following problem to students:
You are about to make your favorite cookie recipe.
You check the bowls in the kitchen and the only one
you can find is a 5-quart bowl. Will you be able to
make the cookies in that bowl? Here is the recipe:
2
1
/
4
cups brown sugar
2
1
/
2
cups white sugar
1
1
/
2
cups butter
3
/
4
cups shortening
5 eggs
1 teaspoon salt
2 teaspoons baking powder
2 teaspoons baking soda
1 teaspoon vanilla
4
1
/
3
cups flour
5
3
/
8
cups oatmeal
What is the total volume of the recipe ingredients in
cups? In quarts?
Procedure
1.
Before starting on the problem, have the students
look at the recipe to find ingredients where the
measurement is not given in cups, and prepare
them to convert these measurements into cups.
Teaspoon measures: total = 6 tsp. = 2 T. =
1
/
8
C.
5 eggs = 1 ¼ C.
2.
Using the TI
-
34
Ö
, find the total volume of the
recipe ingredients in cups.
18
1
/
12
cups
3.
Next, convert the total number of cups into
quarts.
4
25
/
48
4.
Would the ingredients fit in the 5-quart bowl?
Yes
Extension
Ask the students to find other recipes at home and
add up the list of ingredients to determine how
large the bowl would need to be.
