National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Altitudes
Here at the Math Forum, Dr. Math proves the concurrency of the altitudes of a triangle. Links are provided for associated topics.
National Council of Teachers of Mathematics
The Math Forum: Foci of an Ellipse
The question, "If the major and minor axis of an ellipse are given, how do I find the focus points?" is answered at the Math Forum.
National Council of Teachers of Mathematics
The Math Forum: Markdown Savings
This site from the Drexel University contains problems for practicing using percents, using a mock sale as the motif. A link takes you to a model solution.
National Council of Teachers of Mathematics
The Math Forum: Problems Library Geometry Triangles
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Equations of Conics
Posed with a student question about equations of conics, Dr. Math provides some insight on the standard form of parabolas, ellipses, and hyperbolas. One example is shown.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Area of a Parabola
Dr. Math helps a student find the area enclosed by a parabola and an ellipse.
National Council of Teachers of Mathematics
The Math Forum: Spreadsheet Basics
A simple introduction on how to create a spreadsheet.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: A Rectangular Prism
This question and answer site discusses whether it is possible to have a retangular prism that has a volume greater than its surface area.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Zero as Denominator
Math Forum response which explains why zero can not be the denominator of any rational number.
National Council of Teachers of Mathematics
The Math Forum: Measurement: Metric Conversions
This lesson plan has a game to help students convert to various linear metric units and learn their abbreviations.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Commutative Property & Division
Dr. Math answers a question about the commutative property and division. Does it really work? See what Dr. Math has to say.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Logic Definitions: Inductive & Deductive
This site explains what deductive and inductive reasoning is. The site also explains abductive reasoning.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Proving the Pythagorean Theorem
This Ask Dr. Math site explains how to prove the Pythagorean Theorem. Dr. Math gives three variations for proving the theorem.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: How Many Points Determine a Parabola?
This site discusses how many point determine a parabola and then gives an example of finding the equation of a parabola given the sufficient number of points located on the parabola.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Parabola Given Three Points
This site gives a student a hint of how to determine the equation of a parabola when given three points on the parabola. The Dr. only hints at the solution, encouraging thinking on behalf of the student.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Definition of Quadratic Function
Dr. Math briefly defines a quadratic function.
National Council of Teachers of Mathematics
The Math Forum: Drexel University: Example With Rational Root Theorem
This site from Drexel University solves a problem of finding the rational roots of a polynomial using the rational roots theorem, also known as the rational zero theorem.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Using Interval Notation to Express Answers
"Dr. Math" responds to a student question about solving an inequality involving a variable in the denominator.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Centroid: Center of Gravity
At this site you will find am online discussion about the centroid of a triangle. The page begins with a discussion of observations leading to the centroid of a triangle. Dr. Math explains the correct findings as well as the errors made...
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Triangle Centers: Etymologies
At this page you will find Dr. Math responding to an inquiry about the relevance of the names of each of the special triangle centers.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Characteristics of an Orthocenter
Here at The Math Forum, Dr. Math offers interesting properties of orthocenters. Links are provided at the bottom of the page for information on associated topics.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Constructing the Orthocenter
Dr. Math shows how to construct the orthocenter of any triangle using a compass and straight edge.
National Council of Teachers of Mathematics
The Math Forum: Fractals
This site contains many links to Fractal information where students go to the given links to discover interesting facts about fractals and many mathematical equations that represent a fractal.
National Council of Teachers of Mathematics
The Math Forum: "Zero In" Summing to Zero Fraction Game
A card game where students compete to lay down cards - each containing fractions - which sum to zero. The game provides practice for the students who have a working knowledge of the operations with fractions.