I forgot to include these links on fractions--a fun way to practice and preview.
http://www.harcourtschool.com/activity/bowling_for_fractions/
http://www.vectorkids.com/vkfractions.htm
http://www.bbc.co.uk/bitesize/ks2/maths/number/fractions_basic/play/
http://www.thatquiz.org/tq-6/?-j1-l8-n35-p0
http://www.thatquiz.org/tq-6/?-j8-l5-n35-p0
another multiplication fact game...
http://www.arcademicskillbuilders.com/games/meteor/meteor.html