Perimeter of Rectangles and Composite Shapes
Students investigate how the dimensions of a rectangle affect its boundary, calculating perimeter and solving problems involving composite shapes.
Key Questions
- Explain how two shapes can have the same perimeter but different areas.
- Justify why perimeter is measured in linear units.
- Design a strategy to find the perimeter of a composite rectilinear figure.
Ontario Curriculum Expectations
Suggested Methodologies
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Planning templates for Mathematics
5E Model
The 5E Model structures lessons through five phases (Engage, Explore, Explain, Elaborate, and Evaluate), guiding students from curiosity to deep understanding through inquiry-based learning.
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Plan a multi-week math unit with conceptual coherence: from building number sense and procedural fluency to applying skills in context and developing mathematical reasoning across a connected sequence of lessons.
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Build a math rubric that assesses problem-solving, mathematical reasoning, and communication alongside procedural accuracy, giving students feedback on how they think, not just whether they got the right answer.
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