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Recording my strategies


Grade Work Samples
End of Stage 2 (end of Year 4)
Grade A Lee   Sam  
Grade B Kim  
Grade C Courtney  
Grade D Cameron   Jessie   Terry   Pat  
Grade E Casey  

Foundation Statement strands

The following strands are covered in this activity:

Working Mathematically, Number

Description of activity

Students solve addition and subtraction problems and record their strategies.

  1. Students solve the following problem mentally and then record the strategy they used.
  2. 34 + 17

  3. Students repeat the process for the following problems:
  4. 73 – 25
    63 + 29
    162 – 69

The suggested time allocation for this activity is 30 minutes.

Suggested materials

Blank paper, pens

Prior learning

Students have had practice discussing and recording a variety of strategies for mental computations.

Board of Studies NSW, Mathematics K–6 Syllabus, pp 44, 49–50
Board of Studies NSW, Mathematics K–6 Sample Units of Work, p 88

Outcomes

Whole Numbers (NS2.1)
Counts, orders, reads and records numbers up to four digits
Addition & Subtraction (NS2.2)
Uses mental and written strategies for addition and subtraction involving two-, three- and four-digit numbers
Questioning (WMS2.1)
Asks questions that could be explored using mathematics in relation to Stage 2 content
Applying Strategies (WMS2.2)
Selects and uses appropriate mental or written strategies, or technology, to solve problems
Reasoning (WMS2.4)
Checks the accuracy of a statement and explains the reasoning used

Criteria for assessing learning

Students will be assessed on their ability to:

  • use appropriate mental strategies to solve addition and subtraction problems
  • explain their reasoning using mathematical terminology

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