Because curriculum, standards, and testing programs vary widely across the US, ask childrens' teachers and principals to list the topics children in each grade cover and are tested on. Compare these topics with those in the Mixing in Math Content Chart, full version, to choose the Mixing in Math activities that will build the skills critical to children's school success.
To learn more about standards, contact your state's department of education, or consult the National Council of Teachers of Mathematics (www.nctm.org).