Robert from Matthew Pearce Public School sent
a solution to the first part of this problem. Robert says:
So, the completed Carroll diagram would look
Well done also to Eliza from Danebank School
who also completed this diagram.
Rowena from Christ Church Primary told us how
she went about filling in the second Carroll diagram:
Here is a picture of Rowena's completed
You've explained this very well, Rowena. It's
interesting that you've decided that the numbers $1-9$ have zero as
their tens digit and that zero is even. Perhaps some of you have
comments about this?