Discusses the development of data and probability concepts and how some key ideas can be introduced to build an excellent foundation in young students. Develops and extends the concept of simple probability through the use of bar graphs, tallies, frequency tables, and Venn diagrams. Filled with activities for students, some with blackline masters, all designed to stimulate their thinking more deeply about the mathematical ideas. Also supplies helpful margin notes with teaching tips, anticipated student responses to questions, student work, and ways to modify the activities for students experiencing difficulty or needing enrichment. The CD-ROM can be used with Windows or Macintosh.