I worked with a group of pupils from St Mark's Primary School in Ipswich and put together a Maths Trail. The pupils spent time in two and threes walking around the site making up mathematical questions and then went back and took the appropriate photos.
These were then pulled together to form a PowerPoint. I anticipate selections of questions being printed off depending upon the ability of the group. It would also be possible to attach an audio file so that those with poor reading ability could still access the questions.
Clearly the PowerPoint is designed for St Mark's School but they can be easily adapted and photos of your school inserted.
Click here to download the PowerPoint (3Mb)
I have also worked with groups of more able Year 6 pupils on a Code Breaking task which lasted a whole day - Click here