Introducing Build-Ups
What is it?
A unit introducing ‘build-ups’ as a visual tool for developing geometrical language and reasoning.There are seven build-ups, presented in two formats:
- templates for producing acetate overlays that can be used on a visualiser, on an overhead projector or at a desk
- electronic versions, using various dynamic geometry packages.
What does it do?
This unit:- uses acetate overlays or dynamic geometry tools to construct diagrams that help pupils use given facts to ‘build up’ derived geometrical properties
- provides pupils with the language to articulate their reasoning
- supports pupils in moving from a verbal chain of reasoning to a concise written argument.
Why use it?
It is intended:- to strengthen pupils’ understanding and appreciation of rigorous mathematical argument
- to develop pupils’ skills and confidence in deductive reasoning and geometrical proof.
What do I do now?
Read the teacher’s notes on using build-ups, on the following pages:Download a PDF file describing the build-up activities:
Download the resources for the activities:
Electronic versions: