We have some very able mathematicians (G&T?) across the school and the proposal is that once a fortnight a working group of yr3 - yr 6 pupils will work with a teacher (me!) to explore and extend their maths knowledge. I have some ideas (measuring the school and grounds, including height of buildings, making a profit from an enterprise(cake stall), exploring patterns in nature) but wondered if any of you wonderful people out there had any good suggestions/websites (looking at nrich as a first step). Thanks in anticipation.