Evaluation for 5.3c
Materials include supports for students in connecting, creating, defining, and explaining concrete and representational models to abstract (symbolic/numeric/algorithmic) concepts, as required by the TEKS.
The “Concrete, Representational, Abstract Instructional Model” program overview includes various supports for students to connect, create, and define mathematical models in “Progression within and Across Lessons,” “Tasks at the Start of Lessons,” “Visual Learning,” and “Visual Learning Animations” sections. The materials guide students in using concrete objects such as counters, cubes, place-value blocks, and tiles, or pictorial models such as number lines, arrays, grids and strip diagrams in the explore and share sections of “Let’s Build” lessons, as well as the investigate sections of “Let’s Investigate” lessons. Additionally, the materials include abstract concepts in the lesson with supports for students, such as “When students share and discuss solutions, rich conversations deepen conceptual understanding of connections between concrete, pictorial, and abstract.” In
Guía del maestro, lección 2-6, students work on solving problems involving multiplication facts. During the “Explorar y comentar” section of the lesson, students are prompted to represent math ideas by using objects or drawings to represent the multiplication problem and can solve it any way they choose. The student samples provided show one student using a strip diagram to solve using addition only, and the other using pictures to represent and solve using both addition and multiplication. Following the completion of the task, the educator facilitates a whole-group discussion connecting the solution strategies used in the student work samples. The conversation allows students to make connections between the concrete, representational, and abstract by understanding that while both answers were correct, the model that used multiplication to solve was more efficient than addition.
Additionally, the grade 3 materials support students as they connect, create, define, and explain concrete and representational models and abstract mathematical concepts through a structured problem-solving process aligned to the TEKS. The
Guía del maestro includes lección 1-8 “Explorar y comentar,” where the “Elaboremos” provides solar panels as visual representations to help students connect the model to arrays and multiplication and division concepts. Students use counters to create arrays and develop an understanding of the relationship between multiplication and division. After modeling the arrays with concrete manipulatives, students create a multiplication equation and a related division equation using fact families, connecting the concrete and representational models to abstract symbolic representations. The materials also prompt students to explain their mathematical thinking by responding to questions such as “¿Cómo decidieron la cantidad de filas?” “¿Qué representa cada uno de los números en la ecuación de multiplicación?” and “¿Cómo se relacionan con los números de la ecuación de división?” These questions require students to define the meaning of the models, explain the relationships among the representations, and connect concrete and representational models to abstract mathematical concepts and procedures. Additionally, the “Manual de resolución de problemas” provides students with a problem-solving process that includes analyzing information, selecting representations, determining solutions, justifying reasoning, and evaluating the problem-solving process. The accompanying “Hoja de anotaciones” guides students to organize known and unknown information, select representations such as diagrams and equations, and explain their solutions. The “Diagramas de tiras” provide visual models for addition, subtraction, multiplication, division, and comparison situations and connect these representations to equations such as 13 + 30 = 43, 78 – 49 = 29, 4 x ? = 36, and 14 x 8 = 112, supporting students in relating visual models to abstract numerical representations. At the beginning of each Tema, the materials provide a math background to guide understanding of key concepts that develop over the course of the Tema. For example, in Tema 1, lección 1-2 and lección 1-3, students use different models to represent multiplication problems such as equal groups, equal lengths on a number line, and arrays. Students investigate ways to join equal groups, which allows them to develop a foundation for understanding multiplication. In lección 1-4, students connect their knowledge from the previous lesson and use abstract thought when given visuals showing the commutative property in multiplication. Students make observations and notice the array can be rotated 90 degrees and the product will remain the same.