Magnetic number fishing, they add what they catch! As well as addition, develops hand/eye coordination, fine motor--I love this for magnetic letter fishing too! When they catch a letter, they say its name and sound.
First Grade Yahtzee- All they have to do is roll 2 dice and cross out the sum. They keep going until they have crossed out all of the numbers. They learn the hard way how hard it is to roll a 2 or a Lots of other fun math games too!