If necessary before approaching the $6$ by $6$ array, present two sheets with a $4$ by $4$ array. Try not to go through it completely, but just try a couple of multiplications and then turn the top sheet over (or around, or both) and see what a few of the multiplications would be then.
The six by six grid can be printed from here (doc
), and then presented to the pupil(s). The challenge may need to be explained very clearly so as to prevent a lot of unnecessary calculations being made.
Explain to me the solutions that you have come to.
What else could you explore?