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Assessment Resource Centre (ARC)

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1. Stage 3
2. Mathematics
3. Activities
4. Perimeter

## Perimeter

Midway through Stage 3 (end of Year 5)
New Work Samples
Haley
Alex
Kim
Pat
Taylor

## 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:

1. How did you work out the length of the sides of the first shape?
2. How did you find another shape?
3. 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.