This Technology Treasure Trunk mini-collection contains content resources that feature applets appropriate for students in grades preK-2. An applet is a self-contained, interactive, computer-based resource that enables the user to engage in a mathematical investigation and/or to visualize a mathematical concept. Click the resource title to open the ORC record with information about the mathematics content and standards alignment along with any special technology needed to use the resource. The resources are organized by their alignment to the academic content standards: number, geometry and measurement, algebra, and data analysis and probability. (author/sw)