Do your students have a "working number"? This is the number that they are working on to develop fluency in the ways to make it. If your student has a working number of six, they are working on internalizing all the ways to make six (5+1, 2+4, 3+3, etc). Toss and Cover is a quick a great year long center to have students working on their level .
All you need are copies of the addend mat (in color or b/w) beans (or some sort of counter from your math manipulatives) and the page your child needs to work on. Students drop the beans onto the Addend Mat and create the math problems. They then cover the math problem they've created and drop the beans again. Students can play against each other to see who will cover their mat first.
I also have a Toss and Color game that covers the same math problems, but is only in black and white and students color to cover their answers. This is great to send home for homework. Students just use the page for the number they're working to master.
If you're interested in BOTH the Toss games, I've bundled them together at a discount.