Use these uniquely-designed cards to reinforce the content from the CCSS. The sets give students a variety of problem-solving opportunities and can then be used to form collaborative groups. 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 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.