## 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:*

## Description of activity

Students solve addition and subtraction problems and record their strategies.

- Students solve the following problem mentally and then record the strategy they used.
- Students repeat the process for the following problems:

34 + 17

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