These squares have been made from Cuisenaire rods. Can you describe
the pattern? What would the next square look like?
Cut differently-sized square corners from a square piece of paper
to make boxes without lids. Do they all have the same volume?
Can you use this information to work out Charlie's house number?
We had a variety of solutions sent in with
different explanations. Here's the first that came to us and it's
from Y6B from Newton Primary School:
Abhishek got into algebra and sent in
this neat solution.
Hafizur from Stepney Green Maths and Computing
College London, also sent in a good explanation.