http://www.softschools.com/math/games/addition_practice.jsp

I just found the greatest online game - the link is above when you open it, you will find this page
Check NO regroup 0 decimals
First addend minimum 0
First addend maximum 5
Second addend minimum 0
Second addend maximum 5
Total 5
Any number of problems
Then go! Watch your child have fun

We have to master facts to 5 before going to first grade! What a fun way to do it!