In this Colombian classroom the teacher models to students how to factorise a quadratic expression, before leading them to visualise this process. The teacher builds on this by using a visual representation for a more complex quadratic, as well as showing the class how to solve these as quadratic equations. The teacher is logical and clear in her steps, steadily leading the class forward.

This is an urban, public school. Watch out for how the teacher:
- Establishes a known procedure for factorising

- Models an alternative approach with a visual representation

- Progresses the visual approach to a more complex problem

How do you use different types of representation in your own classroom?