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Calculations at the Crazy Cookie Company
Name:
Class:
Date:
You have been hired to be the accountant(s) for the Crazy Cookie Company. They want you to
help them track their costs and profits.
Matrix multiplication will help you do your job. First, you must know how it’s done.
Work through the problems on your handheld, using the CrazyCookie.tns file as your guide.
Problem Set 1:
 3

 5
3   1 0 
 g

0   3 4 
12

3  g
 3

5  g
 10 

 5 
 3

5




0

0 












 10  12

 g
 5   0
3

0 






[ ____ X ____ ]
+
[ ____ X ____ ]



Product dimensions: ______ by ______
1

 4
7 
2 3  
 g 8  
5 6   
9
 



The
dimension of the left matrix must match the
of the right matrix to find a matrix product.
Product dimensions come from the number of
number of
in the right matrix of the product.
Suzanne Moyers
Algebra 2



dimension
in the left matrix BY the
Page 1
Calculations at the Crazy Cookie Company
Problem Set 2:
Product dimensions will be
1

3
5

1

2
  7
8 9 10 
4  g

11
12
13
14


6  
 7 
2  g 
11 
1

by
.












 8 
2  g 
12 
1

___+___ =___ ___+___ =___
3

 7 
4  g 
11 
3

 8 
4  g 
12 
5

 7 
6  g 
11 
5

 8 
6  g 
12 
Fill in the result matrix:
Suzanne Moyers





 9 
4  g 
13 
3

 9 
6  g 
13 
10 
4  g 
14 
10 
6  g 
14 
5

___+___ =___ ___+___ =___
_ _ _ _
_ _ _ _
Algebra 2
10 
2  g 
14 
___+___ =___ ___+___ =___
5

___+___ =___ ___+___ =___
1

___+___ =___ ___+___ =___
3

___+___ =___ ___+___ =___
 9 
2  g 
13 





Page 2
Calculations at the Crazy Cookie Company
Problem Set 3:
Design a table (using matrices) that will display cost and profit for all three stores. Decide
which information will be located in each cell of the matrix and how to go about calculating
each element of the matrix.
Cost and Profit Data (per cookie)
Chocolate Chip
Peanut Butter
Snicker Doodle
Decorated
Unit Cost
$0.15
$0.10
$0.08
$0.20
Profit (per unit)
$0.20
$0.25
$0.15
$0.10
Sales data (by store)
Store 1
Store 2
Store 3
Chocolate
Chip
120
80
72
Peanut
Butter
97
59
84
Snicker
Doodle
64
36
29
Decorated
75
60
48
What will be the dimensions of the new product matrix?
.
Why?
.
Fill in and label the blank table on the next page. Place Xs through unused areas of the
table. On the lines that follow the table, explain how you obtained your results, including
the reasons why the results are valid.
Suzanne Moyers
Algebra 2
Page 3
Calculations at the Crazy Cookie Company
Suzanne Moyers
Algebra 2
Page 4
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