This site, a joint project of the U.S. Department of Education and the National Science Foundation, offers interactive math problems that teachers and families alike can use to help children understand basic math concepts such as algebra, graphs, geometry, decimals, fractions, estimation, rates and velocity, and volume, among others. With math challenges like "What's my Angle," "Play Ball," "Stamps," and "Double or Not," students and their parents can sit down and work through the problems together, while enjoying the format of a game-type activity. Math challenges can be downloaded into a PDF


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