Tomato sauce

Tomato sauce

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Working with Students
Further Resources
This task is about working out the best price.
This table shows the prices for all the different types of tomato sauce and container sizes available at a supermarket.   
illustration: bottle of tomato sauce
 
Brand
Size of Container 
  250 ml 500 ml 750 ml 1 Litre (1000 ml)

Crest

$2.20

$3.95

$6.45

$9.00

Acorn

$1.90

$4.05

$6.25

$7.90

Watkins

$2.25

$4.55

$6.70

$9.20

 
 
a)
 
   
 
If Petra chose a 500 ml container, which brand would be the best value for money?
 
__________
 
b)
Karen bought some 250 ml bottles of Watkins tomato sauce for $2.25 a bottle.
 
How much would a litre cost if she bought several of these bottles?   $ __________
 
c) Joseph bought some 750 ml bottles of Crest tomato sauce that each cost $6.45.
 
 
i) 
 
ii)
How many bottles would he need to buy to have 3 litres of sauce?   __________
 
How much would each litre of sauce cost him?   $ __________
 
d)
To get the best value for money, you should buy the _______________ brand
 
of sauce in a __________ ml container.
Task administration: 
This task is completed with pencil and paper only.
Level:
5
Description of task: 
Students work out the costs and the best value for money of a range of tomato sauce bottles.
Learning Progression Frameworks
This resource can provide evidence of learning associated with within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
   

Y10 (08/2000)

a)

 

Crest

very easy

b)

 

9

easy

c)

i)
ii)

4
8.60

easy
difficult

d)

 

Acorn, 250

difficult

Diagnostic and formative information: 
 

Common error

Likely calculation

Likely reason

c) ii)

25.80

6.45 × 4

Cost of 3 litres.

d)

Acorn, 1000

 

Assumes 1000 ml will be most economical size.