Date: 2 April 2026

Time: 0830 - 1000

Venue: Nan Hua Primary School

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Teacher: Ms Lin Jie-Min, Chelsea (Nan Hua Primary School)

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This P6 open-classroom session aims to develop students’ mathematical reasoning through a carefully designed optimisation task that involves strategic modification of cylinder dimensions. Participants will observe how this low-floor, high-ceiling task can be scaffolded to guide and stretch students’
learning.
 

Starting with basic cylinder relationships, students will be challenged to modify the dimensions to adapt to more complex constraints. Through guided exploration and mathematical reasoning, students will iteratively reconfigure their cylindrical structures. Teacher questioning and comparison of different approaches will prompt students to articulate their thinking process, justify their choices, and refine their strategies as they work towards developing broader generalisations.

Key pedagogical practices to stretch math talents will be adopted, including the use of open-ended prompts, purposeful extensions, and structured opportunities to bring about mathematical reasoning. The lesson also seeks to demonstrate how this mathematical investigation tasks can be used to develop critical, adaptive, and spatial thinking skills.