These uniquely designed cards reinforce the content from the CCSS, giving students a variety of problem-solving opportunities that can then be used to form collaborative groups. Contains 120 cards, 40 cards per grade level, that can be assigned on or off-grade level as needed. Set also includes four additional cards for a teacher to create 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.