Math off the Shelf (MotS) was designed to help those who work in public libraries put math into what they do with grades K-6 children and their families. Public libraries exist in virtually every community in the nation, and increasingly, families rely on them as a free, safe place for children to spend time in the absence of other care. As such, they are an ideal venue for reaching a large and diverse population with math. MotS has: (1) developed research-based English/Spanish materials for informal educators working in public libraries, available for free online (2) supported implementation and institutionalization at libraries across the nation (3) engaged informal educators working in libraries in conducting outreach via state and national library association meetings, webinars, and community and youth agencies (4) conducted evaluation on project impact, as described in the summative evaluation report attached. Dissemination to professional communities will constitute the remaining project work. External evaluation, conducted by Char Associates, identified dramatic changes in attitudes about math and its role in the library, in the amount of math that librarians offer to children and families, and in librarians' communication about math with patrons and peers. Development partners include the library systems of Queens NY, San Jose CA, St Louis MO, Westchester County NY, and dozens of libraries in AZ, CT, FL, and MA.