# School canteen: best buy: level 1

TLF ID L1928

Buy supplies online for a school canteen. Purchase given amounts of items such as bottles of orange juice and boxes of sultanas. Notice that the unit prices are different for packs of different sizes. Perform basic calculations to work out how many packs you will need, and which available pack size will be the cheapest. For example, in order to purchase 144 boxes of sultanas (available in packs of 6 for \$2.40, packs of 18 for \$6.75 or packs of 36 for \$13.80), how many packs will you need and which will be the cheapest option? Complete the shopping list and calculate the total cost. This learning object is the third in a series of eight objects that progressively increase in difficulty.

#### Educational details

Key learning objectives
• Students use halving and doubling, thirding 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;
• Experiment;
• Estimation;
• Analysis;
• Modelling
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.

## Related items

Others in the series: