Stage: 2 Challenge Level:
This problem is a very basic introduction to combinations and permutations. The hints would make good questions to ask children once they have had a first go and encouraging them to talk about what they are doing is invaluable. Using "real" Cuisenaire rods (and OHT rods for demonstration purposes) will give children a chance to try out ideas if they are not able to use the interactivity. One of
the main aims of this problem is to give pupils the opportunity to work in a systematic way, which might need discussion and modelling.