We have been doing a lot of subitizing lately and I found this awesome game to help develop the skill. Cover each square on the game board with a square. Have one partner lift up the square for three seconds while the other tries to guess what the number is. They put the square back after three seconds and then guess the number. If they are correct they get to keep the square. If they get it wrong they have to put the square back and it's the other persons turn. The one with the most squares at the end wins. My students loved this game!
Click HERE to get a copy from the BEAM website.