## Perimeter - Terry : Grade Commentary

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Terry has demonstrated a very high level of competence in calculating and recording perimeter measurements. Thorough knowledge of the formula for determining the perimeter is evident in the construction of the regular and irregular four-sided shapes. Sequential mathematical thinking has been demonstrated but there is one inaccuracy in measurement. The dimensions of the shapes have been described but the explanations need elaboration and there is some confusion in the response to the last question. This work sample demonstrates characteristics of work typically produced by a student performing at grade B standard midway through Stage 3.

The student has a thorough knowledge and understanding of the content and a high level of competence in the processes and skills. In addition, the student is able to apply this knowledge and these skills to most situations.

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## Foundation Statement strands

The following strands are covered in this activity:

• Working Mathematically
Students ask questions and undertake investigations, selecting appropriate technological applications and problem-solving strategies. They use mathematical terminology and some conventions and they give valid reasons when comparing and selecting from possible solutions, making connections with existing knowledge and understanding.
• Measurement and Data
Students select and use the appropriate unit to estimate, measure and calculate length, area, volume, capacity and mass. They use 24-hour time in real-life situations and construct timelines. Students draw and interpret a variety of graphs using a scale.