NCTM Standards
NCTM Standards 2000 addressed within the InterMath Ratios, Proportions, and Percent Unit
Grades 68
NUMBER and OPERATIONS STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 Understand numbers, ways of representing numbers, relationships among numbers, and number systems.
In grades 68 all students should work flexibly with fractions, decimals, and percents to solve problems; compare and order fractions, decimals, and percents efficiently and find their approximate locations on a number line; develop meaning for percents greater than 100 and less than 1; and understand and use ratios and proportions to represent quantitative relationships.
 Understand meanings of operations and how they relate to one another.
In grades 68 all students should understand the meaning and effects of arithmetic operations with fractions, decimals, and integers; and use the associative and commutative properties of addition and multiplication and the distributive property of multiplication over addition to simplify computations with integers, fractions, and decimals.
 Compute fluently and make reasonable estimates.
In grades 68 all students should select appropriate methods and tools for computing with fractions and decimals from among mental computation, estimation, calculators or computers, and pencil and paper, depending on the situation, and apply the selected methods; develop and analyze algorithms for computing with fractions, decimals, and integers and develop fluency in their use; develop and use strategies to estimate the results of rationalnumber computations and judge the reasonableness of the results; and develop, analyze, and explain methods for solving problems involving proportions, such as scaling and finding equivalent ratios.
ALGEBRA STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 Understand patterns, relations, and functions.
In grades 68 all students should represent, analyze, and generalize a variety of patterns with tables, graphs, words, and, when possible, symbolic rules.
 Represent and analyze mathematical situations and structures using algebraic symbols.
In grades 68 all students should develop an initial conceptual understanding of different uses of variables.
 Use mathematical models to represent and understand quantitative relationships.
In grades 68 all students should model and solve contextualized problems using various representations, such as graphs, tables, and equations.
MEASUREMENT STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 Understand measurable attributes of objects and the units, systems, and processes of measurement.
In grades 68 all students should understand relationships among units and convert from one unit to another within the same system.
 Apply appropriate techniques, tools, and formulas to determine measurements.
In grades 68 all students should solve problems involving scale factors, using ratio and proportion.
PROBLEM SOLVING STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 build new mathematical knowledge through problem solving;
 solve problems that arise in mathematics and in other contexts;
 apply and adapt a variety of appropriate strategies to solve problems;
 monitor and reflect on the process of mathematical problem solving.
REASONING AND PROOF STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 recognize reasoning and proof as fundamental aspects of mathematics;
 make and investigate mathematical conjectures;
 develop and evaluate mathematical arguments and proofs;
 select and use various types of reasoning and methods of proof.
COMMUNICATION STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 organize and consolidate their mathematical thinking through communication;
 communicate their mathematical thinking coherently and clearly to peers, teachers, and others;
 analyze and evaluate the mathematical thinking and strategies of others;
 use the language of mathematics to express mathematical ideas precisely.
CONNECTIONS STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 recognize and use connections among mathematical ideas;
 understand how mathematical ideas interconnect and build on one another to produce a coherent whole;
 recognize and apply mathematics in contexts outside of mathematics.
REPRESENTATION STANDARD
Instructional programs from prekindergarten through grade 12 should enable all students to
 create and use representations to organize, record, and communicate mathematical ideas;
 select, apply, and translate among mathematical representations to solve problems;
 use representations to model and interpret physical, social, and mathematical phenomena.
