I liked the look of this Nrich task thinking that my Year 7s, who have shown some appetite for investigative tasks, would enjoy it.
It’s a great task, but like so many investigations, you really need to have a go at it first yourself. I did it with my daughter (Yr7) and we took nearly an hour to find the 3×3. And I was trying pretty hard! Interestingly the 4×4 was much easier. Here are our combined efforts!
I have also created a worksheet as I feel that my class will need a bit more scaffolding on this task. I now know that I will encourage them to move onto the 4×4 if they get fed up with the 3×3.
I’ll update this post tomorrow once I have taught the lesson.