These uniquely designed cards can be used to start a lesson, review previous content, in learning centers, or for individual practice. As a whole-class activity, students solve the problem on their own card; then students with the same answer form collaborative groups for further problem-solving activities. Set contains 120 cards, 40 cards per grade level, that can be assigned on- or off-grade level as necessary. Teacher´s guide provides complete instructions, including suggestions for problem-solving lessons for the collaborative groups. Grades 3-5.