Thinking it would be fun for him to place number tiles to match with pictures, I made up some pages with pictures of items in groups . . . and a blank square near each group, for placing a number tile.
And it worked! This activity was one of my young kids' favorite ones. The picture pages were passed down through several children, and it gave them something special to do for school-- just for them-- and just like their older siblings, they were doing "math pages."
Because we had a variety of different pictures, a very young child could go through them, doing one each day, and then start over again in random order-- so these pages could be continuously used for quite a while.
Later on, I redrew the pictures (our originals were getting worn), and made a set of these full-color pages that can be printed out (onto card stock); it is called Counting Cards, and is available either by itself, or in a preschool math bundle (along with Preschool Math: Number Tiles).
Here are some examples of the picture pages; there are 15 different printable pages:
For more info see www.gentleshepcurr.com/math.html