AvailableSecondary mathematics
Expanded Tabletop
Expansion of the square of a sum
Overview
A square tabletop is enlarged by adding strips of equal width along its edges. Students investigate how the total surface area changes and discover how geometric decomposition leads naturally to the expansion of a square. The lesson connects area reasoning, visual representation, and algebraic structure.
Key ideas
- Area models
- Algebraic representation
- Visual reasoning
- Expansion of expressions
How this lesson is built
This lesson follows the MSS learning flow: situation, observation, exploration, representation, formalisation, and application.
Read the full learning flowResources
- Lesson designReady
- Teacher guideReady
- Student activitiesReady
- Assessment ideasReady
Lesson video
Lesson video coming soon.