We've been having lots of fun and studying homeschool math at the same time with a wonderful game called Equate.It is a game very much like Scrabble but instead of using letters to build words, players use numbers to build equations.
Beginning several years ago, we used the Junior tiles. After using the Junior tiles for a while, players are ready for the regular tiles.
Recently we've started playing with the Advanced tileswhich include negative and positive integers, integer exponents, and more fractions.
It took me a while to get in the swing of thinking about negative exponents again...
For those looking for homeschooling mathematics fun and games, we also love ThinkFun Math Dice.