So I just took the core of what they needed to keep working on and in an evening made a bunch of work mats for them to use. I am keeping them in a binder next to the dominoes in my math center area. When kids finish early, they open up the binder, grab the game they want, and get at it. I tried to make a few of the mats flexible so that I could have them do addition, subtraction, multiplication, and even fractions if they wanted to. I have sent this to some of my buddies K-5 and they have been able to easily implement them in.
If you like it, it's only $2 at my Teacher's Pay Teacher's store.