Assessment resource Biscuit factory: three gears: assessment

TLF ID L9782

Test your understanding of ratios by interpreting three-wheel gear systems where the wheels have different numbers of teeth. For example, how many rotations does a 10-tooth gear wheel make when driven by two driver wheels having 20 and 10 teeth? Also, choose a combination of three gear wheels to achieve a required number of rotations of a specified wheel. This assessment object is one in a series of two objects.



Educational details

Key learning objectives
  • Students interpret situations involving sense of rotation and using clockwise and anticlockwise conventions.
  • 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

7; 8; 9

TopicsFactors; Ratios
Learning area
  • mathematics
Strand
  • Mathematics/Number
  • Mathematics/Working mathematically
  • Mathematics/Measurement
Student activity
  • Interactives;
  • Experiment;
  • Analysis;
  • Modelling

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
  • Name: Gayl O'Connor
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
  • Publisher
  • Date of contribution: 20 Sep 2013
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
  • Script writer
  • Name: Howard Reeves
  • Address: Lindisfarne TAS 7015 Australia
Access profile
  • Colour independence
  • Device independence
  • Hearing independence
  • Generic
Learning resource type
  • Assessment 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.