National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Definitions of Rational, Irrational
Math Forum definition and explanation of rational and irrational numbers, the definitions of mathematics is also addressed.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Irrational Pi
Math Forum response to the question of why pi is not rational if it is a ratio of circumference to diameter.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: About Rational Numbers
Math Forum response giving a rather thorough overview of rational and irrational numbers, with a brief look at the history of these and other number sets.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Square Roots and Irrational Numbers
Math Forum response to whether square roots of all non-perfect squares are irrational. Contains a proof showing that such cases are, indeed, irrational.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Irrational Numbers; Rational Square Roots
Dr. Math responds to how one can tell whether a number is rational or irrational. A proof is discussed in the response.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Domain and Range
This page from the Math Forum contains a question and answer session on how to find range in rational functions. Example problem is given.
National Council of Teachers of Mathematics
The Math Forum: Learning to Factor
Math Forum Faq which briefly defines greatest common factor and links to an in-depth investigation of how the GCF is found.
National Council of Teachers of Mathematics
The Math Forum: Finding the Greatest Common Factor of Two Numbers
Math Forum response to question about finding the greatest common factor by using the factoring tree method.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Formula for Greatest Common Divisor.
This site is a question and response to a student asking Dr. Math about the greatest common divisor, he gives an interesting way to find the gcd, as well as the button on calculators which commonly does the math for you.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Greatest Common Factors, Least Common Multiples
Math Forum response to request for info on how to find greatest common factors, and how this compares to least common multiples. Explanation includes examples of each.
National Council of Teachers of Mathematics
The Math Forum: Rotational Symmetry
This is a good site for elementary teachers to help educate students about symmetry by using pattern blocks. This link has multiple activities that the instructor could use including technological and standard activities.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: What Is a Ratio?
The question posed to Dr. Math is, "What is a ratio and how do you do it?" Dr. Math breaks it down in this detailed explanation using real world scenarios.
National Council of Teachers of Mathematics
The Math Forum: Calculating Sales Tax
Dr. Math is asked about calculating sales tax. A quick and easy to follow explanation of how it works using fractions, decimals, ratio, and percent.
National Council of Teachers of Mathematics
The Math Forum: Geometry: Introduction for Primary Students
These lessons are designed to guide young children through an introduction to geometry. Children learn to recognize shapes and to create patterns, and explore spatial relations and symmetry. Each activity is aligned to mandated standards.
National Council of Teachers of Mathematics
The Math Forum: Lesson Plan: Measurement, "Inch by Inch"
This is a great measurement lesson plan with a literature connection, "Inch by Inch" by Leo Lioni. It uses a variety of activities where students use the inch unit.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: History of Numbers
Dr. Math tackles the question of man's first use of numbers by relating the work of Denise Schmandt-Bessarat and her studies of "'tokens' found all over the Middle East.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Inequalities
"Dr. Math" responds to a student question about solving inequalities. Within the response, a list of the properties of inequalities is provided. Site by Math Forum
National Council of Teachers of Mathematics
The Math Forum: Analytic Geometry Formulas
This site from The Math Forum defines and explains, with examples, analytic geometry. Content includes a focus on one, two, and three dimension analytic geometry. Links are also provided for additional information.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Inequality
Dr. Math gives a hint of how to prove the triangle inequality theorem when answering a question posed about proving an absolute value problem using the triangle inequality theorem.
National Council of Teachers of Mathematics
The Math Forum: Basic Divisibility Rules
This site offers a short quick reference list of divisibility rules with links to the explanations
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Compound Inequality (No Intersection)
"Dr. Math" responds to a student question about possible solutions to compound inequality problems, the Dr. addresses the possiblity of no intersections for a conjunctive answer.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Solving Inequalities and Absolute Values
"Dr. Math" provides an indepth explanation in solving inequalities that involve absolute value. The indepth explanation revolves around a specific problem sent in by a student. This site includes a graph of the absolute value problem.
National Council of Teachers of Mathematics
The Math Forum: Fractions: Middle School Lessons & Materials
A large archive of sites to help teachers with lesson plans and materials for teaching fractions. Geared toward middle school students and teachers.
National Council of Teachers of Mathematics
The Math Forum: Pascal's Triangle
Students can find all sorts of number patterns in Pascal's Triangle.