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# 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.

#### Educational details

Key learning objectives
• Students investigate the application of strategies to assist in calculating subtractions mentally.
• Students investigate the application of the associative principle to assist in calculating subtractions mentally.
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

4

Learning area
• mathematics
Strand
• Mathematics/Number and algebra
Concept
• Mathematics/Subtraction
• Mathematics/Whole numbers
• Mathematics/Algorithms
• Mathematics/Mental arithmetic
• Mathematics/Number relationships
Skill
• Analysis;
• Application;
• Comprehension;
• Knowledge
Student activity
• Interactives;
• Analysis;
• Experiment;
• Modelling
Learning design
• Independent learning;
• Experiential learning;
• Problem solving;
• Visual learning

#### Other details

Contributors
• Technical implementer
• Subject matter expert
• Publisher
• Date of contribution: 27 May 2014
• 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.