I wrote the numbers 1-10 on separate pieces. I placed them in order and just asked him to point to each number as I called it out. We pointed to the numbers as we counted from one to 10, then 10 back down to one.
Emma saw we were "playing a game" and she wanted to be included. I then made up a few pieces for her with pictures she could identify. I took turns asking them to point out numbers or shapes. They loved it. So simple and it took a total of 1 minute to assemble, and 5 minutes to play, short and educational. We finished by piling all the numbers up and he had to lay them out in order 1 to 10, he did great. Simple, just wanted to share a quick idea :)