Here's an old laminated set that I had in one of my tubs that we are now able to use with Noah.
On the left hand side of each matching pair is the left hand with a numeral. The child simply finds the matching right hand numeral to team them back up together.
How I placed them on the tray. I decided to only do a few at a time to begin with.
How they look when completed.
Now, it's been many, many years since I found this free online, somewhere, and I cannot remember where they are found. If I remember though, or find them again, I'll come back and let you know.