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The take-away bar: go figure

Learning objects The take-away bar: go figure

TLF ID L102

This tutorial is suitable for use with a screen reader. It explains strategies for solving subtractions in your head such as 87-39. Work through sample questions and instructions explaining how to use linear partitioning techniques. Solve subtractions by breaking them up into parts that are easy to work with, work out each part and then solve the original calculation. This learning object is one in a series of five objects.

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Educational details

Educational value
  • Supports the development of mental strategies to solve subtraction problems.
  • Explains ‘Round to the nearest 10’, ‘Subtract tens then ones’, ‘Subtract ones then tens’ and ‘Compensate’ strategies.
  • Can be used with a screen reader.
Year level

3; 4

Topics Equations Positive integers Subtraction Mental arithmetic Associativity
Learning area
  • Mathematics

Other details

Contributors
  • Contributor
  • Name: CWA New Media
  • Organization: CWA New Media
  • Description: Technical implementer
  • Address: NEW ZEALAND
  • URL: http://www.cwa.co.nz/
  • Name: Maths Technologies Ltd
  • Organization: Maths Technologies Ltd
  • Description: Subject matter expert
  • Address: NEW ZEALAND
  • URL: http://www.nzmaths.co.nz/
  • Name: Education Services Australia
  • Organization: Education Services Australia
  • Description: Data manager
  • Publisher
  • Name: Education Services Australia Ltd
  • Organization: Education Services Australia Ltd
  • Description: Publisher
  • Address: VIC, AUSTRALIA
  • URL: http://www.esa.edu.au
  • Resource metadata contributed by
  • Name: Education Services Australia Ltd
  • Organisation: Education Services Australia Ltd
  • Address: AUSTRALIA
  • URL: www.esa.edu.au
Access profile
  • Colour independence
  • Device independence
  • Hearing independence
  • Generic
Learning Resource Type
  • Interactive
  • Text
Rights
  • © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.