There are lots of answers to this problem, depending on what questions you choose to ask.
These solutions came in from Tanners Brook Primary School the teacher explained the situation. The children worked in mixed ability groups from our Year 5 and Year 6 Maths sets. They are encouraged to work collaboratively as Mathematicians to further their reasoning and language use. I have attached the photos of the work that the children
completed. Their 'audience' for the piece of work was to try to get work submitted onto the NRICH website. It made them really consider carefully their presentation. A larger version is well worth looking at here.doc