I wrote the numbers 1-9 on a small whiteboard. Next to the whiteboard, I placed a bowl with magnetic numbers 1-9 in it.
R matched the magnetic numbers to the numbers on the whiteboard. I named the numbers as R matched them. After he was done, he took the numbers off the board and put them back in the bowl. I got him to trace over the numbers on the whiteboard. This removed the numbers. R was delighted with this and continued until all the numbers were 'wiped' off.
This was a simple activity to set up and R enjoyed it.