This activity provides children with the chance to develop their visualisation skills, their descriptive and positional language and collaborative ways of working together.
Begin with piles of A4, A5 and A6 paper in two/three different colours at the front of the room. Hold up a piece of paper and ask the children to think (silently on their own) about how they would describe this piece. Then in a pair encourage them to talk about their ideas. Finally ask them to share their ideas with the rest of the class. Do this several times,
hopefully drawing out the language of small, tiny, medium, large, big and the colours of the paper. A nice point to discuss is that comparing sizes makes it easier to give a label, for example medium is only obvious when seen alongside small and large. Depending on their experience, some learners may also describe the pieces of paper as rectangles but this is certainly not essential.
Next ask one child in each pair to tell their partner what size and colour of paper they are going to collect from the piles at the front and then do so. This continues until each pair has three different sizes of each colour in front of them.
Now you play a “1, 2, 3 ... show me” game where you describe a size and colour of paper (without holding up an example) and on the count of “1, 2, 3 ... show me” one of each pair holds up the piece that matches your description. You can vary this to include more than one piece of paper e.g. “One of you hold up the medium blue piece and the other person hold up the small red piece.” Or you could give a negative instruction e.g. “Hold up a piece that isn't large or blue” etc.
You could then introduce the challenge as in the problem.
What size piece are you holding? How do you know? (Can they compare it to justify the small/medium/large -ness of it?)
Which size don't you have yet?
What is the same/different about these two pieces of paper?
Use a box without a lid (the boxes that photocopier paper comes in are ideal) place several pieces of paper inside it, arranged in a particular way (some challenging ideas shown below) and then invite one of each pair to come and look down into the box. They must think about how to describe what they can see and then return to their partner (with hands on heads to prevent doing or
pointing) and try to get them to recreate what was in the box e.g. “The small red piece is in the middle of the large blue piece, facing the same way”.
Encourage children to place their pieces of paper in groups when they are fetching the different sizes and colours, to help determine how many large/small, red/blue pieces they have and which sizes and colours they have yet to collect. Ordering the pieces by size once they have them all, might help children pick out a particular size and colour more easily too.