Washington, D.C., Schools Chancellor Michelle A. Rhee has decided to expand the district's investment in pre-K-8 campuses, making it a major element in the program of school closures and consolidations she launched last month. At a cost of $58 million, five elementary and middle schools will expand to pre-K-8, receiving students from the shuttered schools when classes begin in August. An additional 13 will become pre-K-7 this fall and add eighth grade in 2009.