This article attempts to extend current research and development activities related to the use of technology in problem posing, to early grades mathematics. It is motivated by the authors' work with elementary preservice teachers toward this goal, both at the graduate and undergraduate levels. New York State Learning Standards for K-4 mathematics serve as a background for technology-enabled learning. Spreadsheet-based environments designed by the authors (using Microsoft Excel 2004) are introduced from a tool kit perspective, enabling a meaningful combination of manipulative and computing activities by elementary preteachers and their students alike. (Contains 5 figures and 1 endnote.)