this and just have the students draw a number. Or this one.
Making 5 on the SMART Board - the students make five, write the number of each in the blank, and then write a math problem. 3 + 2 = 5
Xtra Math is a great website for practicing math facts - that is all it is, but it does keep up with your students progress and you can check on how they are doing. It will surprise you how quickly some children pick this skill up. It can also be done at home.
A great little addition game on the touches.