This item includes our five sets of Common Core Collaborative Cards for grades 3-5: Base Ten, Fractions, Algebraic Thinking, Geometry and Measurement & Data. Each set contains 120 cards, 40 cards per grade level (3,4 and 5). Each card features a challenging problem and the sets can be used with the whole class to form collaborative groups or in smaller groups or individually. A great way to reinforce key concepts. In addition to the cards, each set includes a comprehensive teacher guide with answers.