These uniquely-designed cards will challenge students with a variety of different types of problems to reinforce CCSS content. They can then be used in collaborative groups, small groups, or individually. Each set contains 120 cards (4" x 6") 40 cards per grade level, that can be assigned on- and off-grade level as necessary. Teacher´s guide provides complete instructions and suggestions for collaborative group problem-solving lessons. Grades 6 and 7 students work with rational numbers and division of fractions by fractions. The number line is featured as a model to illustrate decimals and integers. In Grade 8, students work with irrational numbers and solve problems in the Functions domain.