An Online Math Dictionary It's Awesome! http://www.amathsdictionaryforkids.com/
Connected Math (CMP Grades 6-8) Web site for parents and students http://connectedmath.msu.edu/parents/
Need practice with fractions? Look here! http://www.visualfractions.com/
Math Games! You get to pick the topic. http://www.gameclassroom.com/games/6/math