I use this lesson with my Year 7 Maths class towards the end of our topic which looks at Shapes and Angles. It allows the students to integrate Art with their Maths and is very tactile. We create mobiles on Fluro paper which stay nice and bright in our room for some time after the topic is over. This lesson can easily be adapted for primary classes. If you don't have Word or WordPad, try the html version .
Students can then begin research into their particular polygon.
This year to allow more learning styles to be catered for I have left the presentation to be optional. All will have an oral component though. I usually allow students 2-3 lessons to work on their task and adapt as necessary. Presentations are then scheduled for the next couple of lessons. This activity also leads into discussion about our calendar and its name origins.