From about £4
Thermometer work can be a really interesting way of discovering the school grounds and rooms. Taking measurements through out the school can lead to the development of heat maps. Other questions which it can raise are:
Where is the most heat being used?
Where would be the warmest place outside for a small animal?
Can we measure heat loss by a thermometer?
Which rooms are above the average? Get the kids to issue energy warnings?
Measuring temperature in and out of the sun?
Does a box made of white or black paper raise the temperature more?
Whilst this does overlap with the energy part of the Science curriculum it does make for an engaging explorations which allows the student use maths to discover things about their world.