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# Balance the cups

TLF ID L5974

Put blocks (or balls) into the cups on the scales to make them balance, using the number rules A = B + C and A + B = C + D. Use your knowledge of addition and multiplication to help you work out how many blocks you need in each cup. Finish the number sentence to show an equal number of blocks on each side. This learning object is a combination of three objects in the same series.

#### Educational details

Key learning objectives
• Students apply a number relationship to determine a range of values for variables.
• Students construct number sentences to record the equivalent relations by inserting missing values.
Educational value
• Provides experience in basic algebraic thinking by applying rules and constructing equations using strategies such as substituting values.
• Promotes understanding that an equation is an expression of equality.
• The equal-arm balance (scales) provides a dynamic model of equality that allows the student to explore number relations.
• Includes a print option that provides a record of the solution and a new similar problem to solve.
Year level

4

Learning area
• mathematics
Strand
• Mathematics/Number and algebra
Concept
• Mathematics/Number concepts
• Mathematics/Number operations
• Mathematics/Number patterns
• Mathematics/Number relationships
• Mathematics/Number sentences
• Mathematics/Numbers
• Mathematics/Thinking
• Mathematics/Simple equations
• Mathematics/Reasoning
• Mathematics/Working mathematically
• Mathematics/Equations
• Mathematics/Algebra
• Mathematics/Algebraic methods
• Mathematics/Arithmetic
Skill
• Knowledge;
• Comprehension;
• Application;
• Analysis
Student activity
• Interactives;
• Experiment;
• Analysis;
• Modelling
Learning design
• Experiential learning;
• Independent learning;
• Problem solving;
• Visual learning

#### Other details

Contributors
• Publisher
• Date of contribution: 20 Sep 2013
• Organisation: Education Services Australia
• Address: Melbourne VIC 3000 Australia
• URL: http://www.esa.edu.au/
• Script writer
• Subject matter expert
• Name: Dr Jenni Way
• Organisation: University of Western Sydney
• Technical implementer
• Validator
• Name: Graham Jones
• Organisation: Griffith University
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.