Changing prices

Changing prices

Pencil and paper
Overview
Using this Resource
Connecting to the Curriculum
Marking Student Responses
Further Resources
This task is about adding and subtracting decimal numbers.

Sign: DVDs cost $24.95 and CDs cost $19.95

Lachlan and Sarai collect old CDs and DVDs. They buy them from Megahits Music Store.
 
a)
Megahits Store increases the price of DVDs by $0.70 but reduces CDs by $1.30.
Sarai plans to buy 7 DVDs and 4 CDs.
 
 
i)   Would Sarai have to pay more for her DVDs and CDs before or after the price changes?
 
Before  /  After      (Circle one)
     Working
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

ii)  What will the difference in price be? $__________
Task administration: 
This task is completed with pencil and paper only.
Copyright: 
Image: Clker (Public domain)
Level:
5
Curriculum info: 
Maths, Number and Algebra, Number Strategies
Keywords: 
decimals, addition, subtraction, multiplication, division, problem solving, money
Description of task: 
Students calculate how price changes affect a purchase.
Learning Progression Frameworks
This resource can provide evidence of learning associated with
Additive thinking
Multiplicative thinking, sets 8-9
within the Mathematics Learning Progressions Frameworks.
Read more about the Learning Progressions Frameworks.
Answers/responses: 
 

Y10 (09/1999)
a) i)
ii)		 Before
$0.30		 2 correct – difficult
1 correct – moderate