Extra Math Practice
IXL provides a fun and engaging environment in which students can practice their math skils and be rewarded for their hard work. If you purchase a membership, you can also set goals, track students' progress, and monitor their usage information.
This site features a library of over 2,700 instructional videos and 240 practice exercises covering a variety of subjects, including many elementary mathematics topics.
XtraMath is a free web-based program that helps students master basic addition, subtraction, multiplication, and division facts. Students learn to recall them quickly and accurately and can then use these math facts as a basis on which to build more complex problem-solving skills.
Has many fun and creative activities ("math challenges") to strengthen basic mathematic skills.
Everyday Mathematics Online provides many useful resources for students and parents, including games and an interactive reference book to help with assignments. To use it, you'll need to know your username and password, which you can get from your teacher if your school has subscribed.
Interactive online arcade games make practicing math skills fun!
Help with Understanding Concepts
Offers a host of web-based virtual manipulatives and concept tutorials.
Primarily aimed at teachers, this website provides tutorials and explanations to help deepen understandings of central concepts.
Provides fun and interactive quizzes to reinforce topics such as fractions, geometry, graphs, and much more.
Links to a collaborative online community, as well as practice problems and puzzles, to supplement classroom learning.