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# School canteen: estimate and check: level 2

TLF ID L1934

Buy supplies online for a school canteen. Purchase given amounts of items such as bottles of orange juice and sesame bars. Notice that unit prices vary depending on the multiples in which items are sold. Look at the shopping list and check the prices and package sizes from the price catalogues of two traders. Estimate which trader will supply all the goods for the lowest total cost. In this level, perform slightly harder calculations to test your estimate of the total cost from each price catalogue. This learning object is the last in a series of eight objects that progressively increase in difficulty.

#### Educational details

Key learning objectives
• Students use doubling and trebling strategies in multiplicative situations.
• Students solve problems by selecting and applying efficient multiplicative strategies.
• Students solve problems using or involving ratios and rates.
• Students solve problems in a shopping context.
Educational value
• Students are encouraged to use efficient multiplicative strategies to solve arithmetic problems.
• Students solve arithmetic problems involving money and quantities.
• Calculations require recognition and use of factors and multiples of whole numbers and measures; recall of multiplication and division facts.
• Randomised quantities and costs support repeated use.
Year level

6; 7

Learning area
• mathematics
Strand
• Mathematics/Number and algebra
Concept
• Mathematics/Money
• Mathematics/Multiples
• Mathematics/Multiplication
• Mathematics/Factors
• Mathematics/Computation
• Mathematics/Division
• Mathematics/Whole numbers
Skill
• Analysis;
• Application;
• Comprehension;
• Knowledge
Student activity
• Interactives;
• Analysis;
• Modelling;
• Estimation
Learning design
• Experiential learning;
• Independent learning;
• Problem solving;
• Visual learning

#### Other details

Contributors
• Technical implementer
• Script writer
• Name: Rod Rees
• Organisation: Rees Films Pty Ltd
• Address: Blackburn VIC 3130 Australia
• Subject matter expert
• Name: Howard Reeves
• Address: Lindisfarne TAS 7015 Australia
• Educational validator
• Publisher
• Date of contribution: 20 Sep 2013
• Organisation: Education Services Australia
• Address: Melbourne VIC 3000 Australia
• URL: http://www.esa.edu.au/
Access profile
• Colour independence
• Device independence
• Hearing independence
Learning resource type
• Interactive Resource
Browsers
• Microsoft Internet Explorer - minimum version: 8.0 (MS-Windows) - maximum version: 9.0 (MS-Windows)
• Firefox - minimum version: (MS-Windows)
• Safari - minimum version: 5.1 (MacOS)
Operating systems
• MacOS - minimum version: 10.6
• MS-Windows - minimum version: XP - maximum version: 7
Rights
• © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.

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