VandeWalle: If you need any of the blakcline masters listed in Van de Walle, this is the site to go to.
Arcademic Skills Builder: Math fact games, and the teacher can track how students are performing. This site has been funded, at least in part by National Science Foundation.
Gamequarium: website full of math games, sorted out by skills. It has lists of links, with graphics and some descriptions. The actual games are located on a variety of websites, so you may want to vet them, prior to having students go to them. Once you have found games that will meet your students needs, you can always copy the links, so they don't have to continually go through the gamequarium site.
Mathematrix: Site that likes to explore mathematical recreations, like rubix cubes, mobius strips, polynomials, etc.
Math Playground: math games, manipulatives, and activities
Fun math activities and games: This site has a variety of games and activities, and they are split up according to skills to be practiced.
Math Baseball: funbrain game where kids can choose addition, subtraction, multiplication, or division.
100th day of school: school website of ideas for celebrating
Mobius Strips: There are a number of sites available if you would like to explore mobius strips with your students.
Here are a few of them-Explanation of what a mobius strip is, and questions to ask. PBS kids site on making a mobius strip. World of Escher-visuals of mobius strips.
Strategy Games: several different games. Each one has instructions available. Click on the instructions link in the top right corner.
Virtual Manipulatives: Great for demonstrating with a presentation station or promethean, or allowing students to try on their own.
Pi: if you are interested in showing students facts about Pi, or if students want to explore on their own, this site offers some interesting facts, as well as some puzzles.
Math Activity Printable: you can save to your google docs.
Khan Academy: Website with videos and math exercises. Non-profit website through MIT
Bill Gates talks about Khan Academy
Math Mama Blog: Technology bootcamp ideas.
Arcademic Skill Builders: Math Games
Reaction Timer: Click on the star, and then click as soon as it reappears. The site measures reaction time in 100ths of a second. You can use it to find the average, or compare times.