Evaluation for 4.2b
Materials demonstrate coherence vertically across concepts and grade bands, including connections from grade K–6, by connecting patterns, big ideas, and relationships.
The materials demonstrate strong vertical coherence across concepts and grade bands, specifically connecting patterns, big ideas, and relationships from kindergarten throughGrade 6. This is evident through the consistent progression and extension of key mathematical models and concepts. For example, ten frames are initially introduced for counting in kindergarten and then strategically extended for addition and subtraction inGrade 1, illustrating a foundational pattern for number sense.Additionally, cube trains are utilized for counting, addition, and subtraction in kindergarten, continuing for these operations inGrade 1, and then further developed for measuring length inGrades 1–2, showcasing how a singlemanipulatorsupports evolving mathematical ideas. Number lines serve as a consistent model throughoutGrades 1–6 for ordering, modeling, and operations. Their use gradually extends from whole numbers to fractions, decimals, and integers, culminating in their application on the coordinate plane, demonstrating a clear progression of relationships.Furthermore, inGrade 6, percents are modeled with strips and area models, directly connecting to and building upon the representations of fractions and decimals introduced in earlier grades, highlighting the relationship between these related concepts.Area is introduced and connected to multiplication inGrade 3, and subsequently, area models are consistently used throughoutGrades 4–6 to model multiplication and division with whole numbers, fractions, decimals, and variable expressions, showcasing a coherent development of a big idea across multiple grade levels and increasing complexity.