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Assessment resource Biscuit factory: two gears: assessment

TLF ID L9781

Test your understanding of ratios by choosing two gears of different sizes according to specific criteria. Complete a pair of gears, or choose the combination of two gears, depending on how many rotations each gear must make. For example, choose a belt gear size of 10 teeth and a driver of 40 teeth to make the belt gear rotate 4 times for every 1 rotation of the driver. This assessment object is one in a series of two objects.

Educational details

Key learning objectives
  • Students demonstrate multiplicative thinking strategies to interpret situations and solve problems involving ratios.
Educational value
  • Tests student understanding and interpretation of multiplicative thinking and ratios as applied to a practical situation.
  • Assesses student's thinking in relation to solving ratio problems in a gear system.
  • Includes a printable report of the student’s performance for teacher–student discussion.
Year level


TopicsFactors; Ratios
Learning area
  • mathematics
  • Mathematics/Number and algebra
    • Analysis;
    • Application;
    • Comprehension;
    • Knowledge
    Student activity
    • Interactives;
    • Experiment;
    • Analysis;
    • Modelling
    Learning design
    • Experiential learning;
    • Independent learning;
    • Problem solving;
    • Visual learning

    Other details

    • 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
    • Name: Gayl O'Connor
    • Organisation: Education Services Australia
    • Address: Melbourne VIC 3000 Australia
    • URL:
    • Publisher
    • Date of contribution: 20 Sep 2013
    • Organisation: Education Services Australia
    • Address: Melbourne VIC 3000 Australia
    • URL:
    • Technical implementer
    Access profile
    • Colour independence
    • Device independence
    • Hearing independence
    • Generic
    Learning resource type
    • Assessment resource
    • 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
    • © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.