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# In proportion: variables in ratios

TLF ID L8101

Complete customer orders for a large hardware store by interpreting the ratios. Work in the gardening department to fill orders for liquid fertiliser (expressed as ratios). Examine the equations suggested to you by your colleagues. Choose and solve the correct equation to complete each order. This learning object is the fourth in a series of six learning objects.

#### Educational details

Key learning objectives
• Students construct representations (both verbal and symbolic) for ratios by interpreting the amounts from contextual settings.
• Students formulate equations that represent proportional relationships between two (or more) ratios.
• Students apply mathematical skills to solve and interpret equations that represent a proportional relationship between two (or more) ratios.
Educational value
• Develops students’ multiplicative thinking, with respect to ratios, in a practical setting.
• Requires students to select equations that correctly represent practical situations involving ratios.
• Encourages students to check that their solutions are consistent with the practical situations from which the equations were derived.
• Includes scaffolded feedback.
Year level

8; 9

Learning area
• mathematics
Strand
• Mathematics/Number and algebra
Student activity
• Interactives;
• Experiment;
• Analysis;
• Modelling

#### Other details

Contributors
• Subject matter expert
• Name: Howard Reeves
• Address: Lindisfarne TAS 7015 Australia
• Educational validator
• Name: Graham Jones
• Address: Gold Coast QLD 4217 Australia
• Technical implementer
• 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
• Generic
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.