Good luck! Let me know which sites you used!
Math Millionaire Games: based on Who Wants to Be a Millionaire game show
Math Playground: an action-packed site for elementary and middle school students. Practice your math skills, play a logic game and have some fun! (highly recommended)
The Pi Trainer: Helps students to memorize pi
This website promotes open-ended and playful explorations of important math concepts in the context of online games, interactive applets, and activity suggestions. Starting with the magic chalkboard, a student enters Math Cats to explore the worlds of polygons, large numbers, magic squares, and much more.
ASK DR. MATH
A neat place to go for internet activities, projects, puzzles, reference, ask Dr. Math.
Great math reference site. Visit here for help with concepts from fractions to place value to scientific notation.