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TITLE 19EDUCATION
PART 2TEXAS EDUCATION AGENCY
CHAPTER 111TEXAS ESSENTIAL KNOWLEDGE AND SKILLS FOR MATHEMATICS
SUBCHAPTER BMIDDLE SCHOOL
RULE §111.28Grade 8, Adopted 2012

    (C) use models and diagrams to explain the Pythagorean theorem.

  (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;

    (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;

    (C) use the Pythagorean Theorem and its converse to solve problems; and

    (D) determine the distance between two points on a coordinate plane using the Pythagorean Theorem.

  (8) Expressions, equations, and relationships. The student applies mathematical process standards to use one-variable equations or inequalities in problem situations. The student is expected to:

    (A) write one-variable equations or inequalities with variables on both sides that represent problems using rational number coefficients and constants;

    (B) write a corresponding real-world problem when given a one-variable equation or inequality with variables on both sides of the equal sign using rational number coefficients and constants;

    (C) model and solve one-variable equations with variables on both sides of the equal sign that represent mathematical and real-world problems using rational number coefficients and constants; and

    (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 angle-angle criterion for similarity of triangles.

  (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 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.

  (10) Two-dimensional 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 two-dimensional shapes on a coordinate plane;

    (B) differentiate between transformations that preserve congruence and those that do not;

    (C) explain the effect of translations, reflections over the x- or y- axis, and rotations limited to 90°, 180°, 270°, and 360° as applied to two-dimensional shapes on a coordinate plane using an algebraic representation; and

    (D) model the effect on linear and area measurements of dilated two-dimensional shapes.

  (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, non-linear, and no association between bivariate data;

    (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; and

    (C) simulate generating random samples of the same size from a population with known characteristics to develop the notion of a random sample being representative of the population from which it was selected.

  (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 real-world problems comparing how interest rate and loan length affect the cost of credit;

    (B) calculate the total cost of repaying a loan, including credit cards and easy access loans, under various rates of interest and over different periods using an online calculator;

    (C) explain how small amounts of money invested regularly, including money saved for college and retirement, grow over time;

    (D) calculate and compare simple interest and compound interest earnings;

    (E) identify and explain the advantages and disadvantages of different payment methods;

    (F) analyze situations to determine if they represent financially responsible decisions and identify the benefits of financial responsibility and the costs of financial irresponsibility; and

    (G) estimate the cost of a two-year and four-year 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.


Source Note: The provisions of this §111.28 adopted to be effective September 10, 2012, 37 TexReg 7109

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