ABSTRACT
Could you get overweight by eating one extra snack each day? How many people can travel down a tube line in the rush hour? Is it possible to get all the energy, protein and fibre you need just by eating bread? What effect do delays have on how fast you can make a journey? All these questions require quantitative reasoning. They are the kind of questions tackled by pupils as part of the Tools for Exploratory Learning Programme (see Chapter 1). This looked at the reasoning used by pupils' working with different kinds of computer model — quantitative, semi-quantitative and qualitative. For each of these kinds of reasoning, computer tools were developed; here we shall look at pupils' use of the tool to support quantitative reasoning.
