Two top resources for math facts for children are Sheppard Software and Education World. Both offer free online games for children that help make learning math fun and allow children some freedom over what they practice and when.
Sheppard Software offers a variety of topics for children to practice. These topics include, but are not limited to, decimals, fractions, money and place value.
Education World offers free lesson plans that encourage teachers to make learning fun. The lessons offer games, as well as step-by-step instructions on how to set up the games and a list of online games for children to try during class.