Nick, Harish and Jonathan from Mason Middle School investigated these street numbers in groups of three. They wrote:When you add the first number on the top and the third number on the bottom they equal seven.
Ella from the British School in Amsterdam did a similar thing and said that the diagonal totals are the same number.
I wonder whether anyone can explain why?
We'd love to hear about other things you investigate. Please don't worry that your solution is not "complete" - we'd like to hear about anything you have tried. Teachers - you might like to send a summary of your children's work.