## Perimeter

Grade | Work Samples |
---|---|

Midway through Stage 3 (end of Year 5) | |

Grade B | Mackenzie Terry |

Grade C | Bobby Sam |

Grade D | Xiang |

## Foundation Statement strands

*The following strands are covered in this activity:*

## Description of activity

Students investigate how many different four-sided shapes they can construct with a perimeter of 20 centimetres. They record their findings and answer the following questions:

- How did you work out the length of the sides of the first shape?
- How did you find another shape?
- Do you have all possible shapes that have a perimeter of 20 cm? How do you know?

## Suggested materials

Paper, pencils, grid paper

## Prior learning

Students have estimated, measured, compared and recorded lengths and distances using metres, centimetres and millimetres. They have estimated and measured the area of two-dimensional shapes.

## Outcomes

**Length (MS3.1)**

Selects and uses the appropriate unit and device to measure lengths, distances and perimeters**Applying Strategies (WMS3.2)**

Selects and applies appropriate problem-solving strategies, including technological applications, in undertaking investigations**Communicating (WMS3.3)**

Describes and represents a mathematical situation in a variety of ways using mathematical terminology and some conventions**Reasoning (WMS3.4)**

Gives a valid reason for supporting one possible solution over another

## Criteria for assessing learning

Students will be assessed on their ability to:

- construct a variety of four-sided shapes with a perimeter of 20 centimetres
- describe how the dimensions of shapes were determined
- explain how they verified their results.