It only goes up to grade 6, however, some of the games apply. On the left hand side, there is a link titled "LINKS"...click on that for a million other websites for cool math games!
You can create a PDF of graph paper with this site. The default settings are usually good enough, but you may want to play around with the settings to create something else.
Good practice of arithmetic with games that are actually pretty fun. The best part is that kids can play against each other (creating a game that others can join) if they want to. Good for add/subtract/multiply/divide/integers.