 J. Frank Dobie Junior High School
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8th Grade Math TEKS

8th Grade Math TEKS
Grade 8 Mathematics Assessment
Eligible Texas Essential Knowledge and Skills
STAAR Grade 8 Mathematics Assessment Mathematical Process Standards These student expectations will not be listed under a separate reporting category. Instead, they will be incorporated into test questions across reporting categories since the application of mathematical process standards is part of each knowledge statement.
(8.1) Mathematical process standards. The student uses mathematical processes to acquire and demonstrate mathematical understanding. The student is expected to
(A) apply mathematics to problems arising in everyday life, society, and the workplace;
(B) use a problemsolving model that incorporates analyzing given information, formulating a plan or strategy, determining a solution, justifying the solution, and evaluating the problemsolving process and the reasonableness of the solution;
(C) select tools, including real objects, manipulatives, paper and pencil, and technology as appropriate, and techniques, including mental math, estimation, and number sense as appropriate, to solve problems;
(D) communicate mathematical ideas, reasoning, and their implications using multiple representations, including symbols, diagrams, graphs, and language as appropriate;
(E) create and use representations to organize, record, and communicate mathematical ideas;
(F) analyze mathematical relationships to connect and communicate mathematical ideas; and
(G) display, explain, and justify mathematical ideas and arguments using precise mathematical language in written or oral communication.
Reporting Category 1: Numerical Representations and Relationships The student will demonstrate an understanding of how to represent and manipulate numbers and expressions.
(8.2) Number and operations. The student applies mathematical process standards to represent and use real numbers in a variety of forms. The student is expected to
(A) extend previous knowledge of sets and subsets using a visual representation to describe relationships between sets of real numbers; Supporting Standard
(B) approximate the value of an irrational number, including p and square roots of numbers less than 225, and locate that rational number approximation on a number line; Supporting Standard
(C) convert between standard decimal notation and scientific notation; and Supporting Standard
(D) order a set of real numbers arising from mathematical and realworld contexts. Readiness Standard
Reporting Category 2: Computations and Algebraic Relationships The student will demonstrate an understanding of how to perform operations and represent algebraic relationships.
(8.4) Proportionality. The student applies mathematical process standards to explain proportional and nonproportional relationships involving slope. The student is expected to
(A) use similar right triangles to develop an understanding that slope, m, given as the rate comparing the change in yvalues to the change in xvalues, (y2 – y1)/(x2 – x1), is the same for any two points (x1, y1) and (x2, y2) on the same line; Supporting Standard
(B) graph proportional relationships, interpreting the unit rate as the slope of the line that models the relationship; and Readiness Standard
(C) use data from a table or graph to determine the rate of change or slope and yintercept in mathematical and realworld problems. Readiness Standard
(8.5) Proportionality. The student applies mathematical process standards to use proportional and nonproportional relationships to develop foundational concepts of functions. The student is expected to
(A) represent linear proportional situations with tables, graphs, and equations in the form of y = kx; Supporting Standard
(B) represent linear nonproportional situations with tables, graphs, and equations in the form of y = mx + b, where b ? 0; Supporting Standard
(E) solve problems involving direct variation; Supporting Standard
(F) distinguish between proportional and nonproportional situations using tables, graphs, and equations in the form y = kx or y = mx + b, where b ? 0; Supporting Standard
(G) identify functions using sets of ordered pairs, tables, mappings, and graphs; Readiness Standard
(H) identify examples of proportional and nonproportional functions that arise from mathematical and realworld problems; and Supporting Standard
(I) write an equation in the form y = mx + b to model a linear relationship between two quantities using verbal, numerical, tabular, and graphical representations. Readiness Standard
(8.8) Expressions, equations, and relationships. The student applies mathematical process standards to use onevariable equations or inequalities in problem situations. The student is expected to
(A) write onevariable equations or inequalities with variables on both sides that represent problems using rational number coefficients and constants; Supporting Standard
(B) write a corresponding realworld problem when given a onevariable equation or inequality with variables on both sides of the equal sign using rational number coefficients and constants; and Supporting Standard
(C) model and solve onevariable equations with variables on both sides of the equal sign that represent mathematical and realworld problems using rational number coefficients and constants. Readiness Standard
(8.9) Expressions, equations, and relationships. The student applies mathematical process standards to use multiple representations to develop foundational concepts of simultaneous linear equations. The student is expected to
(A) identify and verify the values of x and y that simultaneously satisfy two linear equations in the form y = mx + b from the intersections of the graphed equations. Supporting Standard
Reporting Category 3: Geometry and Measurement The student will demonstrate an understanding of how to represent and apply geometry and measurement concepts.
(8.3) Proportionality. The student applies mathematical process standards to use proportional relationships to describe dilations. The student is expected to
(A) generalize that the ratio of corresponding sides of similar shapes are proportional, including a shape and its dilation; Supporting Standard
(B) compare and contrast the attributes of a shape and its dilation(s) on a coordinate plane; and Supporting Standard
(C) use an algebraic representation to explain the effect of a given positive rational scale factor applied to twodimensional figures on a coordinate plane with the origin as the center of dilation. Readiness Standard
(8.6) Expressions, equations, and relationships. The student applies mathematical process standards to develop mathematical relationships and make connections to geometric formulas. The student is expected to
(A) describe the volume formula V = Bh of a cylinder in terms of its base area and its height; and Supporting Standard
(C) use models and diagrams to explain the Pythagorean theorem. Supporting Standard
(8.7) Expressions, equations, and relationships. The student applies mathematical process standards to use geometry to solve problems. The student is expected to
(A) solve problems involving the volume of cylinders, cones, and spheres; Readiness Standard
(B) use previous knowledge of surface area to make connections to the formulas for lateral and total surface area and determine solutions for problems involving rectangular prisms, triangular prisms, and cylinders; Readiness Standard
(C) use the Pythagorean theorem and its converse to solve problems; and Readiness Standard
(D) determine the distance between two points on a coordinate plane using the Pythagorean theorem. Supporting Standard
(8.8) Expressions, equations, and relationships. The student applies mathematical process standards to use onevariable equations or inequalities in problem situations. The student is expected to
(D) use informal arguments to establish facts about the angle sum and exterior angle of triangles, the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. Supporting Standard
(8.10) Twodimensional shapes. The student applies mathematical process standards to develop transformational geometry concepts. The student is expected to
(A) generalize the properties of orientation and congruence of rotations, reflections, translations, and dilations of twodimensional shapes on a coordinate plane; Supporting Standard
(B) differentiate between transformations that preserve congruence and those that do not; Supporting Standard
(C) explain the effect of translations, reflections over the x or yaxis, and rotations limited to 90°, 180°, 270°, and 360° as applied to twodimensional shapes on a coordinate plane using an algebraic representation; and Readiness Standard
(D) model the effect on linear and area measurements of dilated twodimensional shapes. Supporting Standard
Reporting Category 4: Data Analysis and Personal Financial Literacy The student will demonstrate an understanding of how to represent and analyze data and how to describe and apply personal financial concepts.
(8.5) Proportionality. The student applies mathematical process standards to use proportional and nonproportional relationships to develop foundational concepts of functions. The student is expected to
(C) contrast bivariate sets of data that suggest a linear relationship with bivariate sets of data that do not suggest a linear relationship from a graphical representation; and Supporting Standard
(D) use a trend line that approximates the linear relationship between bivariate sets of data to make predictions. Readiness Standard
(8.11) Measurement and data. The student applies mathematical process standards to use statistical procedures to describe data. The student is expected to
(A) construct a scatterplot and describe the observed data to address questions of association such as linear, nonlinear, and no association between bivariate data; and Supporting Standard
(B) determine the mean absolute deviation and use this quantity as a measure of the average distance data are from the mean using a data set of no more than 10 data points. Supporting Standard
(8.12) Personal financial literacy. The student applies mathematical process standards to develop an economic way of thinking and problem solving useful in one’s life as a knowledgeable consumer and investor. The student is expected to
(A) solve realworld problems comparing how interest rate and loan length affect the cost of credit; Supporting Standard
(C) explain how small amounts of money invested regularly, including money saved for college and retirement, grow over time; Supporting Standard
(D) calculate and compare simple interest and compound interest earnings; and Readiness Standard
(G) estimate the cost of a twoyear and fouryear college education, including family contribution, and devise a periodic savings plan for accumulating the money needed to contribute to the total cost of attendance for at least the first year of college. Supporting Standard