Change efforts undertaken by schools and districts as a result of obtaining data from the October 1976 testing of 40 mathematics objectives for fourth graders in Delaware are briefly described. End-of-the-year results from 13 districts which gave posttests in May 1977 are also presented. Data are reported by total score, strand, and objective. A concise summary indicates that the 3,831 students tested performed best in grade 4 in the areas of numeration, operations and properties, and mathematical sentences. They were poorest in the areas of graphing and functions, and mathematical reasoning. Approximately 14% were unable to answer at least 50% of the items. (MS)