@clintflint - Really, one of the most simple games people can play with dominoes is a game of matching, where you have all of them face down and have to match the tiles together in order to turn them over.
That helps kids with their memory skills, but you can also make it a bit more relevant and get them to count the numbers before they can officially match the two tiles.
Another way to use dominoes is with what they call a "quick image". The aim of this is to flash several tiles quickly and get the students to tell you how many dots there are altogether.
This teaches them strategies in quick addition, as well as potentially leading them into multiplication if you do it well.