After checking the games closet, here are a few games that involve varying amounts of arithmetic that we play with DD5:

Carcassonne
Risk
Texas Hold 'Em
Yahtzee

I think Mastermind is great for little ones. I tend to think of it as a problem-solving game, but of course math does involve a lot of problem-solving.

Striving to increase my rate of flow, and fight forum gloopiness. sick