Practice and reinforce the content from the Common Core State Standards with these innovative activity cards. These uniquely designed cards can be used as a whole-class activity. First, students solve the problem on their own card; then students with the same answer form collaborative groups for further problem solving activities. Or use cards in smaller groups or individually to give students additional practice with the content they need to know. Each set contains 120 cards, 40 cards per grade level, that can be assigned on or off-grade level as necessary. The set also includes four additional cards are for a teacher to create his/her own custom problems. Durable, two-color cards measure 4" x 6" . Teacher's guide provides complete instructions including suggestions for problem-solving lessons for the collaborative groups.