Fantastic resource!!! I am using this as a stimulus for an INSET which I am leading, the only thing I'm tweeking is by making it interactive so leaving areas for the children to add their own working out. And for my SEN, I'm having a small pouch attached to the display with lots of each shape cut out so that they can use the shapes to physically order them in a systematic way. I will also be adding photographs of my children tackling this. For Key stage 1, you could use a similiar set up but instead of shapes it could be a 2 by 3 egg box with 2 eggs inside - how many different positions could the eggs be placed in?