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Math: Grade 9/10

Draft Standards From The State of California Academic Standards Commission



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State of California Academic Standards Commission



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Mathematics is a language we use every day, often without knowing it. It builds and draws on conceptual understanding and skills, and helps us make decisions and solve problems. In this draft document we have tried to connect the notion of problem solving to conceptual understanding and skill development by embedding it within the content strands at every grade. Given here are only some of the ways you will see this exemplified. Students are asked to:

  • ask relevant questions about problem situations

  • decide between relevant and extraneous information

  • choose appropriate operations tools and approaches to problem situations

  • decide whether an exact or approximate answer is called for

  • apply specific techniques in new situations

  • explain, check, justify, prove, and judge the reasonableness of results

  • create new approaches and connect knowledge and understanding in new ways

Number Sense

1. Students compute with and simplify rational expressions and those containing fractional exponents.

1.1 add and subtract rational expressions having the same denominator, multiply, divide, reduce, and evaluate simple algebraic fractions

1.2 add, subtract, multiply, divide, and simplify expressions containing radicals and fractional exponents

2. Students carry out counting procedures involving sets and arrangements.

2.1 find and solve problems involving the intersection and union of sets

2.2 use combinations and permutations to count the number of arrangements of a set of elements and distinguish between the two

Symbols and Algebra

1. Students solve quadratic, rational, radical, absolute value, and factorable polynomial equations in one variable and non-linear systems of equations in two variables.

1.1 select, justify, and apply a technique to solve a quadratic equation over the set of complex numbers and interpret the results graphically

1.2 formulate and solve problems involving joint and combined variations

1.3 use factoring techniques (e.g., common factor, difference of cubes, grouping), graphing calculators, and synthetic division to solve polynomial equations of degree four or less

1.4 understand the relationships among the coefficients, factors, roots, and x-intercepts of a polynomial function

1.5 solve linear equations and inequalities involving absolute value (e.g., |3x - 4| [less than or equal to]5) and quadratic inequalities (e.g., x^2 - 7x -1 [greater than or equal to]5) and graph their solutions on a number line

1.6 solve linear-quadratic and quadratic-quadratic systems of equations algebraically and graphically

1.7 use parametric equations to model and solve application problems, write equivalent equations by eliminating the parameter paying special attention to any restrictions on the variables

2. Students identify, give information about, and write equations for circles, parabolas, ellipses, and hyperbolas whose axes are parallel to the x­ and y­axes.

2.1 give the center and radius of a circle, the center, vertices, foci, and axes of an ellipse or hyperbola, and the vertex, axis of symmetry, focus, and directrix of a parabola given an equation in standard form and use this information to graph the figure.

2.2 identify a general quadratic equation in two variables (no xy term) as a circle, a parabola, an ellipse, or an hyperbola and write its equation in standard form

2.3 sketch graphs of conic sections from equations, using transformations

3. Students understand the use of matrices to organize information and perform simple operations.

3.1 use matrices to represent and organize data and identify and interpret the meaning of a matrix cell for a given context

3.2 perform and interpret the meaning of matrix addition, subtraction, multipication, and scalar multiplication

3.3 use matrices to represent and solve systems of two linear equations in two variables

3.4 use matrices to translate, reflect, rotate, or scale polygonal figures represented on the coordinate plane

4. Students justify and use properties from number systems to combine and simplify functions and matrices.

4.1 apply commutative, associative, distributive, identity and inverse properties when combining functions (addition, multiplication, composition).

4.2 apply commutative (where applicable), associative, distributive, identity and inverse propertieswhen combining matrices (addition, multiplication, scalar multiplication)


Measurement and Geometry

1. Students demonstrate understanding of the structure of standard measurement systems, use derived units, unit conversions, dimensional analysis, with appropriate accuracy.

1.1 use quotient measures (e.g., speed, density) relate them to slope and "per unit" amounts, and product measures (e.g., person-days)

1.2 use dimensional analysis to check answers and determine the units of a solution

1.3 use the concept of significant digits in giving answers to an appropriate degree of accuracy

2. Students select and use appropriate units, tools, and degrees of accuracy to solve problems involving geometric and non-geometric measures.

2.1 know, use, derive formulas for, and solve problems involving perimeter, circumference, area, volume, lateral area, and surface area of common geometric figures

2.2 describe how changes in the dimensions of an object affect the perimeter, area, and volume (e.g., tripling the radius of a sphere multiplies its volume by 27)

2.3 know, use, derive formulas for, and solve problems involving weight, monetary, and time systems selecting appropriate units and degrees of accuracy

3. Students identify, find missing measures, and solve problems involving angles, right triangles, other polygons, circles, planes and solid geometric objects.

3.1 find and use measures of sides, interior and exterior angles of triangles and polygons to classify figures (e.g., isosceles, obtuse, convex, regular) and solve problems (e.g., determine the number of degrees in a central angle of a regular polygon).

3.2 describe the relationships between vertical angles, angles that are supplementary and complementary, and angles formed when parallel lines are cut by a transversal express and use these to find missing angle measures in such systems

3.3 use the Pythagorean Theorem, its converse, properties of special right triangles (e.g., sides in the ratio 3-4-5, angles of 30-60-90 degrees), and right triangle trigonometry to find missing information about triangles

3.4 develop and implement a plan for obtaining indirect measures using similarity, proportional reasoning and trigonometric ratios

3.5 compare, contrast, classify, and solve problems involving quadrilaterals (square, rhombus, rectangle, parallelogram, trapezoid, kite, cyclic) on the basis of their definitions and properties (e.g., opposite sides, consecutive angles, diagonals)

3.6 apply the properties of angles, arcs, chords, radii, tangents, and secants to solve problems involving circles

3.7 apply the triangle inequality properties (given information concerning the lengths of sides and/or measures of angles) to determine whether a triangle exists and to order sides and angles

3.8 identify the structural parts (e.g., angles, shape of sides, orientation of sides, circumference) and characteristics (e.g., symmetry, shape of cross-sections) and use these to classify objects and answer questions about them (e.g., a penny can be seen as a cylinder with small height so its volume is V= [pi] r^2h).

4. Students demonstrate understanding of an axiomatic system, and the nature of proof.

4.1 identify and give examples of undefined terms, axioms, theorems, inductive, and deductive reasoning

4.2 construct and judge the validity of a logical argument including giving counterexamples and understanding quantifiers

5. Students identify, use, and prove relationships between figures involving congruence and similarity.

5.1 prove the Pythagorean Theorem using algebraic and geometric arguments as well as deductive proof.

5.2 identify similar and congruent triangles and other polygons and their corresponding parts

 

5.3 prove basic theorems about congruent triangles and other polygons using deductive, algebraic, and transformational arguments

6. Students visualize and describe objects, paths, and regions in space.

6.1 use geometric language to describe the intersection of two planes or a plane and a solid object (the cross section it cuts)

6.2 use geometric language to describe how the conic sections are derived as cross sections of a cone

6.3 construct a 3-dimensional figure from a 2-dimensional drawing and a 2-dimensional representation of a 3-dimensional object (e.g., nets, prisms, cones, pyramids)

Functions

1. Students give information about and perform algebraic operations on standard (quadratic, exponential, rational, radical, absolute value, and factorable polynomial) functions.

1.1 give the domain, range, zeros, and express the inverse (for 1-to-1 functions) of a standard function

1.2 represent a standard function as a table of values, an equation, or a graph and translate among these representations.

1.3 determine the composition of two standard functions including necessary restrictions on the domain

1.4 demonstrate and explain the effect that changing a parameter has on the graph of a function (e.g., describe the effect on the graph of y = x^2 + 6x +  C as C grows from -5 to 5)

2. Students demonstrate an understanding of arithmetic and geometric sequences and series.

2.1 identify, describe, extend, and find the nth term of arithmetic and geometric sequences

2.2 find the sum of finite arithmetic and geometric sequences and infinite geometric sequences with |r| < 1, use and interpret [sigma] notation

2.3 relate arithmetic and geometric sequences to linear and exponential functions, and express them in explicit and recursive form

3. Students demonstrate understanding and use of basic types of functions (linear, exponential, polynomial, rational, radical, absolute value, step, and piecewise defined).

3.1 identify a function given as a table of values and equation or a graph as linear, exponential, polynomial, rational, radical (square root or cube root), absolute value, step, or piecewise and explain key characteristics of the function.

3.2 determine which type of function best models a situation, write an equation using technology where appropriate, and use this equation to answer questions about the situation.

3.3 find and interpret the maximum or minimum value of a quadratic function

3.4 find the value of a function for a given element in its domain and determine the natural domain of a given function

Statistics, Data Analysis, and Probability

1. Students collect, display, analyze, and interpret single and bi-variate data and critique the conclusions and uses of statistics in both school materials and public documents

1.1 create, analyze and, interpret data using graphs (frequency distributions, histograms, control charts, scatter plots) and analysis tools (estimated and computer generated regression lines, correlation coefficients, and residuals.)

1.2 apply curve fitting techniques to data and assess the "goodness of fit" of a regression line or curve and its usefulness as a model for the data and make predictions by interpolating or extrapolating from the data or its graph

1.3 explain and critique the process of a survey or experiment, how that might have contributed to or influenced the results (e.g., reliability of sampling procedures, bias, missing or incorrect information), and describe misuses of statistical or numerical data

2. Students estimate relative frequency, compute probability, and demonstrate understanding of ways to make predictions from samples and experiments in situations involving uncertainty including dependent and conditional events.

2.1 choose an appropriate probability model and use it to arrive at a theoretical probability for a simple, compound, or conditional chance event

2.2 graph and interpret probability distributions including the binomial distributions and use them to discuss whether an event is rare or reasonably likely

2.3 demonstrate understanding of a random variable and how it can be used to make predictions about a population from a sample



Credits

The Draft Standards were prepared by:

The State of California Academic Standards Commission
The Commission for the Establishment of Academic Content and Performance Standards Comments may be addressed to The Commission

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