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4. Recording my strategies

## Recording my strategies

Grade Work Samples
End of Stage 2 (end of Year 4)
Grade A
Grade B
Grade C
Grade D
Grade E

## Foundation Statement strands

The following strands are covered in this activity:

## 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